Best Soil For Marijuana Seeds

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Want to know more about best soil for cannabis? Check out our guide to get started with expert recommendations. Soil is the root of all plant life. Plenty of high-quality cannabis soil preparations are now available for growers with all different cultivation styles The best soil for cannabis plants depends on a variety of factors. Learn how to find or make the best soil for growing marijuana!

10 Best Soil for Cannabis in 2022 – Buying Guide & FAQs

Finding the right soil for cannabis planting is never easy. You never know what to get with such a sensitive plant.There are hundreds of soil products on the market. As a result, finding the right one can be difficult if you don’t know what to look for.

I researched the best soil for cannabis and found that FoxFarm Ocean Forest Soil Mix is the best overall option.

But depending on your preferences and grinding needs, you may want something different. If my #1 option is not for you, there are nine other soils on my list. Read on to find out which is the best soil for cannabis for you!

10 Best Soil for Cannabis Review

#1. FoxFarm Ocean Forest Potting Soil Mix

The FoxFarm Ocean Forest is a garden potting soil mix that is ideal to use for cannabis plants.

Each bag contains everything your cannabis plant needs for high growth and germination. It consists of a blend of earthworm castings, sea-going fish and crab meals, moss, bat guano, forest humus, and more. All of these mimic the properties of the highest quality naturally occurring soils.

The soil mix also has sandy loam and hints of clay and silt. With this particular composition, the soil mix allows proper water drainage. Make sure it reaches all sections of the soil to ensure adequate germination.

This is good soil because it has been pH adjusted such that its pH lies between 6.3 and 6.8. What this means is that the soil enables maximum uptake of fertilizer. This also encourages strong branching, leading to healthy and rapid growth.

The only problem you may run into is when you use this for autoflower cannabis strains. It’s not recommended for that kind of cannabis. But for all others, it’s a good choice.

  • Diverse composition for effective growth.
  • Features loam that guarantees proper germination in all sections.
  • A mix of the highest-quality fertilizers.
  • pH-adjusted for maximum fertilizer uptake.
  • Encourages growth.
  • Ideal for most types of cannabis.
  • Not for autoflower cannabis strains.

#2. FoxFarm Happy Frog Organic Potting Soil

Fox Farm Happy Frog Organic Potting Soil is the ideal choice for bringing nutrition to your plants. It comes in a ready-to-use form straight out of the bag and it provides all the nutrients that your marijuana plant needs to thrive.

This is a bag of 51.4 dry quarts or 2 cubic feet of soil. The potting soil is meant for container planting, whether growing a Ficus or a geranium. It contains mycorrhizae which enhances water absorbance and reduces the need for fertilizer. Additionally, this soil contains humic acid. As a result, it increases nutrient uptake and accelerates cannabis seed germination. In other words, your cannabis plants will thrive in this soil.

And that’s not where it ends. The soil is ideal for both outdoor and indoor cannabis plants. The only catch is that the plant must be a container plant.

The best part is that this cannabis organic potting soil comes with a pair of Pearsons Protective Gloves included. Use these gloves to protect yourself when handling any harsh chemicals.

  • Perfect for growing marijuana indoors and outdoors.
  • Reduces the need for fertilizers.
  • Enhances nutrient uptake.
  • Ready-to-use out of the bag.
  • Accelerates seed germination.
  • Only for container plants.

#3. Coast Of Maine Stonington Blend Organic Growers Mix

The Coast of Maine Stonington Blend is an organic mix of soil and fertilizers. It is a complex soil made especially for promoting plant growth in pots and containers.

This soil has a diverse composition. It’s made from fish bone meal, endomycorrhizal fungus, worm castings, and perlite. It also contains dehydrated hen manure and Coco fiber that has been reinforced with lobster compost.

You may think that that’s just a random blend of the best fertilizers. However, it’s actually quite balanced. This blend provides the perfect balance between soil texture, drainage, and water retention. All of these factors stack up to promote the healthy growth of cannabis plants in containers.

What’s more, this blend is OMRI Listed. This means that it follows certain standards for organic fertilizers set by the OMRI.

One major issue with this soil, which you will notice right off the bat, is that it’s only for potted plants.

  • A complex blend of fertilizers.
  • Promotes healthy and rapid growth.
  • Best for potted plants.
  • Authentic organic fertilizer.
  • A perfect balance of growth factors.
  • Only for potted/container plants.

#4. Super Soil Autoflower Concentrate

If you’re on the hunt for the best natural soil for growing autoflower seeds, then this is for you. The Super Soil Autoflower Concentrate is a 5-pound bag of soil that promotes autoflower growth.

Just one 5-pound bag of the soil contains everything your cannabis plant will need from seed to harvest. This is living soil. This means that it contains fungi and microbes that encourage growth. And they symbiotically provide nutrition to the plant.

One thing to keep in mind is that this is a concentration. It should be mixed in a certain ratio with regular potting soil and shouldn’t be used on its own.

What sets this concentrate apart from the rest is that it’s an all-in-one blend. This is not only a top feed but also a soil amendment, compost tea, living soil, super soil, and potting soil.

Be warned, however, this is only for autoflower cannabis and other autoflower vegetables. It would still work for regular seeds, but not so well.

  • Ideal for auto flower cannabis seeds.
  • Promotes growth and provides nutrition.
  • Also doubles as a super soil.
  • Suffices the plant from seed to harvest.
  • Includes fungi and microbes.
  • Only for auto flower seeds.

#5. Purple Cow Indicanja 1 Cubic Foot Bag Organic Living Soil

The Purple Cow IndiCanja is an all-in-one ready-to-use organic soil. This soil is used by many professional farmers and horticulturists as well as hobbyist gardeners.

This is not living soil. It is a mix of compost from various plants containing all the essential nutrients for your plant.

But the manufacturers didn’t just mix in any random combination of compost and organic matter. Instead, the formula was scientifically designed to provide the maximum benefit. This formulation is water-only, meaning you just need to water it after you dump it in the pot.

Moreover, this compost-based solution has been grown and cultivated “cleanly”. This means that it won’t affect human health.

However, you may run into a fungus gnat problem with this soil due to its unique composition. Plus, it’s targeted toward cannabis plants that need to retain a lot of water. Hence, you must be careful not to overwater it.

  • A mix of all essential nutrients your plant needs.
  • Made with scientific input.
  • Only need to water regularly.
  • Cultivated cleanly.
  • Retains a lot of water.
  • May cause a gnat problem.
  • Easy to overwater.

#6. Foxfarms 733266 Soil, Strawberry Fields Potting

FoxFarms Strawberry Fields Potting is a special potting soil. This has been designed to promote blooming and fruiting in plants. This potting soil is ideal for all types of flowering plants, including container gardens, house plants, and trees and shrubs.

This potting soil mix is available in many sizes, including a 1.5 cubic-foot bag. You can also get the 27 and 55 cubic-foot totes for larger gardens.

The FoxFarms Strawberry Fields potting soil is mainly coco coir-based. This is what allows it to retain less water and provide for better water drainage. It doesn’t contain a lot of peat, which means that it must be watered frequently.

It’s highly recommended for mature plants that need to flower, meaning it’ll be by your side when your cannabis is ready for harvesting. The soil pH is about 6-7, which is ideal for growing weed.

However, this soil is strictly for flowering plants. It’s not good for small plants as it simply won’t be as effective.

  • Highly recommended for mature cannabis.
  • Available in 3 sizes.
  • Better water drainage.
  • pH is perfect for growing cannabis.
  • Ideal for flowering plants.
  • Must be watered frequently.
  • Not good for small plants.

#7. Roots Organics Original Potting Soil

The Roots Organics is a potting soil ideal for fast-growing plants that require a lot of care and nurturing. It’s the best choice for cannabis due to its high level of water retention.

To begin with, this mix is made from perlite and coco fiber, two of the best components for plant growth. Additionally, it features pumice, peat moss, and composted forest material. These ingredients lead to better water retention and reduce the need to water the plant.

Roots Organics also doubles as living soil. It contains living mycorrhizal fungi that enhance your plant’s ability to take up water through the roots.

What sets this organic potting soil aside from the others is that it comes ready to use right in the bag. Simply cut the top of the bag and plant your seeds. You can also dump the contents into a container garden.

You might, however, notice some fungus gnats, which are common with the composition this soil has.

  • Promotes healthy plant growth.
  • Enhances nutrient uptake ability.
  • Comes ready-to-use in the bag.
  • Retains a lot of water.
  • Best for cannabis plants.
  • May cause a fungus gnat problem.

#8. Brut Super Soil – 30 Lb

The Brut Super Soil is an organic soil concentrate designed for plants that require extra nutrients. It contains all the nutrients that your cannabis plant may be lacking.

For starters, it’s loaded with bacteria and enzymes that provide all the necessary nutrients your plant needs. On the organic side, it includes Brut worm castings, mycorrhizal fungi, composted cow manure, and kelp. These ingredients help enhance the nutrient uptake ability of your plant.

On the inorganic side, you get elements like magnesium, potassium, nitrogen, and phosphorus. These are required for healthy plant growth.

Keep in mind that this is only a soil concentrate. It is to be mixed with regular potting soil. What’s more, the Brut Super Soil contains peat moss which helps it retain more water. For cannabis plants, this is crucial as they require a lot of water.

What’s more, this soil concentrate is completely non-toxic and odor-free. So it won’t create an unpleasant and unhealthy environment in your garden.

  • Enhances nutrient uptake.
  • Provides all the essential elements.
  • Perfect for cannabis and other plants.
  • Retains a lot of water.
  • Highly organic.
  • Must be mixed with regular potting soil.

#9. Big Rootz All Purpose Potting Soil

Big Rootz is an all-purpose potting soil ideal for growing cannabis and other plants. It has been carefully formulated so that it offers maximum plant growth and helps in nutrient uptake.

This formulation is backed by research and increases plant vigor to lend it strength and sturdiness. This is a blend of peat and triple-washed coir. The peat-based formula indicates that it retains more water and doesn’t need to be watered very often. This is more than ideal for cannabis, a plant that needs a lot of water.

See also  Heirloom Cannabis Seeds

In addition to that, the Big Rootz All-Purpose Potting Soil contains worm castings and compost. Both of these provide essential nutrients such as Nitrogen to the roots of the plant.

This potting soil has been pH-adjusted to provide maximum results and increase the water uptake. However, you may run into a fungus gnat infestation.

  • Backed by research.
  • Retains a lot of water.
  • Provides essential nutrients to roots.
  • A balanced pH for maximum growth.
  • Helps in water and nutrient uptake.
  • May lead to a fungus gnat infestation.

#10. Mother Earth Terracraft Potting Soil

If you want potting soil that is recommended for all types of plants, then Mother Earth Terracraft is the way to go.

This soil consists of Sphagnum peat moss as well as processed forest fertilizer. These ingredients help the soil to retain more water than regular potting soil. In the long run, this means you waste less water and also less time watering your cannabis.

In addition to that, the Mother Earth Terracraft Potting Soil has moderate aeration which further helps it retain water. The blend is made from 8 ingredients, some of which include seabird and bat guano, and earthworm castings.

The Mother Earth Terracraft potting soil has a balanced pH with a traditional buffer. So adding new soils won’t change the pH much. This helps it retain more nutrients and helps the plant take up more water.

However, it’s not meant for autoflower cannabis.

  • Retains more water.
  • Doesn’t need to be watered frequently.
  • Enhances nutrient uptake.
  • Balanced pH with buffer.
  • A unique blend of 8 ingredients.
  • Not for autoflower cannabis.

Buying Guide of Best Soil for Cannabis

Stand-Alone Or Supplement-Based?

Stand-alone soils do not require to be mixed with other ingredients such as fertilizers or amendments. But supplement base soil can be adjusted with fertilizers and amendments accordingly.

Organic Or Inorganic?

Organic soils are best for cannabis as they are safe for the environment and many times include living organisms. Inorganic soils are cheaper and may be useful in some cases. Inorganic soils are usually better if you want to keep track of what and how much nutrients your plant is getting. They state explicitly what minerals they use and in what proportions.

Living Soil or Not?

Living soil contains microorganisms like bacteria and mycorrhizal fungi. So, living soil is ideal as it forms a symbiotic relationship with your plant. The bacteria and fungi allow your plant’s roots to take up more nutrients and water. However, they can give rise to fungus gnats and other insects.

The Number of Plants

Lastly, consider how many plants you have and buy the right size of potting soil accordingly.

General Features of The Best Soil for Cannabis

Nutrients And Amendments

The most commonly used amendments for growing cannabis are:

  • Bat guano.
  • Bone meal.
  • Soft rock phosphate.
  • Shrimp meal.
  • Crab meal.
  • Seabird guano.
  • Fishbone meal.

In addition to that, cannabis plants require a lot of Potassium, Nitrogen, and Phosphorus.

Drainage & Water Retention

Most cannabis plants require a lot of water. Hence, you should look for soils that have a lot of water retention. These don’t need to be watered often.

Ph Value

The pH should stay between 6 and 7. You should look for soil that acts as a pH buffer, meaning it resists changes in its pH to some extent.

What is the Best Soil for Growing Cannabis?

Soil Types

Four basic types of soil can be used for marijuana growth. These include loam, silt, clay, and sand. And each of these has its pros and cons when it comes to gardening marijuana.

Sand is more root growth permeable, but it doesn’t hold fertilizer or water that well. Whereas clay is just the opposite to that. It can become pretty hard when dry and hot, and roots find it tough to penetrate it.

During this time, clay doesn’t drain very well and becomes hard to cultivate. However, it is rich in natural nutrients and minerals.

On the other hand, Silt has plenty of minerals and can also retain moisture pretty well. But it becomes too compacted and tough in various conditions.

It also tends to form a crust that makes it difficult for nutrients and water to get to the roots of marijuana plants.

Loam For Growing Cannabis & Other Crops

Loam is the best option of all four types for growing marijuana and many other types of crops. It is a mix of silt, clay, and sand, and it brings the best qualities of all types of soils while reducing their negative traits.

The pest composition is to go for 20 percent clay, 40 percent silt, and 40 percent sand. Most people think that the pH of 6.0 is ideally suitable for cannabis plants.

However, the acceptable range is between 5.8 to 6.3. as pH levels remain close to neutral, loam is the best option to consider when growing cannabis plants.

There are different test kits available for measuring acidity in your soil. You can also take a sample of your solid to your local extension agent.

If it doesn’t feature proper acidity levels, you can use various soil amendments to increase or decrease the pH levels. Your local extension agent, garden store, or nursery can help you make the correct AdSense according to your requirements.

Loam is the best option for containers, and you can use it for outdoor growing. However, it is also the most expensive soil available on the market.

Nevertheless, if you are interested in growing the best possible plants, quality loam can reward you long-term.

You can even make your loam mixture and add some organic matter. Then, if you have your separate compost bin, you can use it to improve your soil. It might take a lot of your time, but it can also produce magnificent results.

What is a good potting soil for cannabis?

The best potting soil for cannabis plants is loam, as it is for various other plants. It is a mix of silt (40 percent), clay (20 percent), and sand (40 percent). Its pH level remains between 5.8 to 6.3, and it can retain moisture and nutrients pretty well. This soil is also the most expensive type.

Can you plant cannabis in any soil?

You can plant cannabis in any soil, but there will be different implications, and each soil type has its pros and cons. Therefore, the best option to go for is loam soil, as it is a mix of all other soil types while amplifying their advantages and diminishing their drawbacks.

What kind of soil do Autoflowers need?

Autoflowering strains are similar to those photoperiod variations as they also prefer morse acidic soil slightly. You should go for the soil with pH levels between 6.2 to 6.5. But make sure that the soil is suitable based on its acidity.

How To Make Your Own Organic Super Soil?

You can make your organic super soil by using 8 large bags of coco fiber and mycorrhizae-rich cannabis soil. Add 25 to 50 pounds of earthworm castings to it. Now, take:

  • 5 lbs. steamed bone meal.
  • ¾ cups Epson salt.
  • ½ cup sweet lime.
  • 3 lbs. rock phosphate.
  • 5 lbs. Bloom bat guano.
  • 5 lbs. blood meal.
  • ½ cup azomite.
  • 2 tbsp powdered humic acid.

Add all these together and you have your very own organic super soil!

How To Grow Cannabis in Soil?

The first thing you gotta do is fill up ¾ of your container with potting soil. After that, gently place the plant and carefully add more soil to cover up the roots.

The rule of thumb here is to not fill it too compact. These roots tend to thrive from the nutrients within the cannabis soil and from the air pockets within the soil. the tiny roots will prevent the roots from rotting.

Therefore, it is important to refrain from pressing down too much on the soil mix. If you are using soil that already has its pH level adjusted, you can simply add water. Let the plant satisfy its thirst before you add more water to prevent overwatering symptoms.

Conclusion

All the soils on the review list are top quality, and Fox Farm Ocean Forest Soil Mix is the overall best soil for cannabis. Not only because it has sandy loam and hints of clay and silt, but also it has good water drainage and pH value.

Whichever option you choose, make sure it suits your plants’ needs and your budget.

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Umer Abdullah

Hey there! My name is Umer, and I am a garden enthusiast. I discovered the power of the gardening in my 30s. Now five years later, that critical connection with nature continues to improve my life. My goal is to empower you with the advice you need to grow your home garden.

Digging into the dankest dirt: the best soil for growing cannabis

Soil is the root of all plant life…because it literally feeds the roots! Sure, you could use hydroponics to grow cannabis, but despite the extra work, hydroponic systems don’t appear to improve cannabis plant growth or potency over soil which is the tried and true growing medium for marijuana. Despite soil’s relative lack of precision compared to hydroponics, it remains the preferred medium for numerous seasoned cannabis cultivators – and is obviously the way nature intended, as cannabis was growing wild long before humans started domesticating it. 1 2

While many home-growers admire soil, few cultivators can agree on the best soil for growing cannabis. Finding the perfect balance of nutrients, aeration, and water retention can take some time for new and even professional growers to figure out. Not to mention the numerous variables that can influence which soil is ideal, including watering and feeding patterns, types of grow-container used, and even the origin of the variety (or strain) being grown. Thankfully, plenty of high-quality cannabis soil preparations are now available for growers with all different cultivation styles.

Ocean Forest Potting Soil

  • Suitable for potted plants that are moderate to heavy feeders
  • Indoor or outdoor
  • Price: $16.99 – $700+, depending on size

Happy Frog Potting Soil

  • Suitable for potted plants
  • Indoor or outdoor
  • Price: $16.99 – $700+, depending on size

Fox Farm “Bush Doctor” Coco Loco

  • Suitable for potted plants
  • Indoor or outdoor
  • Price: $16.99 – $700+, depending on size

Nature’s Living Soil Autoflower Concentrate

  • Specialized for autoflowering seeds
  • Indoor or outdoor
  • Price: $24, $43, or $68

Purple Cow IndiCanja Organic Living Soil

  • Suitable for potted plants
  • Indoor or outdoor
  • Price: $35.00

Roots Organics Formula 707

  • Suitable for large-container plants
  • Indoor or outdoor
  • Price: ~ $40 – $75

Mother Earth Coco Plus Perlite Mix

  • Suitable for potted plants
  • Indoor or outdoor
  • Price: ~ $75

Ocean Forest Potting Soil

  • Suitable for potted plants that are moderate to heavy feeders
  • Indoor or outdoor
  • Sizes: 12 quart, 2 cubic foot, 27 cubic foot tote, or 55 cubic foot tote
  • Not organic
  • Price: $16.99 – $700+, depending on size
  • contains additions like fish emulsions and crab meal for high nutrient density
  • one of Fox Farm’s most nutrient-dense potting soils
  • full of rich soil amendments like bat guano, crab meal, and fish emulsions
See also  Growing Marijuana From Seed Outdoors

Of Fox Farm’s many best-selling mixes, Ocean Forest usually ranks as the company’s best potting soil for cannabis. This soil formula is more nutrient-dense than Happy Frog, which makes Ocean Forest less reliant on supplemental nutrients. While this could pose problems for young plants, it will help vegetative plants grow to their full potential.

Ocean Forest gets its name from its high concentration of amendments like fish emulsion and crab meal. Ocean Forest’s formula makes nitrogen deficiencies nearly impossible with plenty of earthworm castings and bat guano.

You may need extra nutrients during flowering, but it’s essential to have a light hand when using supplements. Ocean Forest is “hotter” than other potting mixes, so it’s best to cut your recommended feeding schedule by at least half.

If cultivators find Ocean Forest is too hot to handle, they may want to dial it back with milder formulas. For instance, many people enjoy combining Ocean Forest with Happy Frog. Once people learn to use Ocean Forest, they often rave about its performance.

Happy Frog Potting Soil

  • Suitable for potted plants
  • Indoor or outdoor
  • Sizes: 12 quart, 2 cubic foot, 27 cubic foot tote, or 55 cubic foot tote
  • Not organic
  • Price: $16.99 – $700+, depending on size
  • well-balanced
  • mild potting soil ideal for beginners

One of Fox Farm’s “less hot” potting soils, ideal for delicate seedlings.

Excellent soil for beginners who don’t mind adding supplemental nutrients.

Makes it easy to avoid overfeeding and “nutrient burn.”

The Happy Frog Potting Soil is considered one of Fox Farm’s “weaker” soil formulas, but that’s not a criticism! Unlike Ocean Forest, Happy Frog focuses on the beginning stages of growth when plants can’t handle excessive nutrients.

Many cultivators use Happy Frog to give their seedlings a safe space to mature. While Happy Frog has additions like earthworm castings and bat guano, you’ll need to add nutrients as cannabis gets into the vegetative stage.

The allure of Happy Frog is in its simplicity. New growers often have the best time with this soil because they can easily follow their supplemental nutrients’ guide.

Anyone who fears they’ll “overfeed” their cannabis plants should start with a bag of Happy Frog. As you gain more experience with cultivation, consider mixing Happy Frog with more fertilizer-rich formulas during flowering.

Fox Farm “Bush Doctor” Coco Loco

  • Suitable for potted plants
  • Indoor or outdoor
  • Sizes: 12 quart, 2 cubic foot, 27 cubic foot tote, or 55 cubic foot tote
  • Not organic
  • Price: $16.99 – $700+, depending on size
  • rich traces of coco coir provide high-quality pest resistance and water retention
  • high coco coir formula with plenty of nutrient-rich amendments
  • superior water retention and pest resistance

As its name hints, Fox Farm’s Coco Loco formula largely consists of the inert medium coco coir. Unlike plain potting soil, coco coir only has noteworthy traces of potassium. In fact, coco coir is often viewed as a “stepping stone” medium for those transitioning from soil to hydroponics.

While not every grower is a fan of coco coir, it has many excellent features like water retention and pest resistance. Plus, since Fox Farm’s Coco Loco adds ingredients like kelp, bat guano, and earthworm castings, there’s less need to fear nutrient deficiencies.

With Coco Loco, you get the benefits of growing in coco coir without having to significantly adjust your feeding schedule. You may, however, need to tweak your watering schedule, especially if you don’t add perlite which aids in aeration, allowing more oxygen to get to the roots. Coco coir retains moisture more than other mediums, so please resist the urge to overwater!

Nature’s Living Soil Autoflower Concentrate

  • Specialized for autoflowering seeds
  • Indoor or outdoor
  • Sizes: 1 lb., 5 lbs., 10 lbs.
  • Organic
  • Price: $24, $43, or $68
  • rich collection of amendments and microorganisms well-suited for autoflowering plants
  • includes high quality additions ranging from bat guano to bone meal
  • easy to add to regular potting mix for extra root support

Want to create a “super soil” in the shortest amount of time? Try adding Nature’s Living Soil’s Autoflower Concentrate to a generic potting mix.

This well-reviewed soil amendment is so potent you only need to add one pound per five-gallon container. Nature’s Living Soil promises its signature product is “pre-cooked” and contains dozens of beneficial bacteria for autoflowers.

Cultivators are impressed with the wide array of extra compounds like organic earthworm castings, fishbone meal, and kelp. The company also puts beneficial fungi in its formula, which may even give it a slightly “moldy” (but harmless!) appearance.

While Nature’s Living Soil’s Auto Concentrate may seem too hot (or nutrient rich), it’s recommended for all stages of an auto’s life cycle. So, if you want to give your autos a boost, it may be worth your while to mix in this unique concentrate.

Purple Cow IndiCanja Organic Living Soil

  • Suitable for potted plants
  • Indoor or outdoor
  • Sizes: 15 pounds
  • Organic
  • Price: $35.00
  • organic, compost-based “super soil” mix
  • premade “super soil” with dozens of beneficial microorganisms
  • ultra-green organic formula made with compost

Purple Cow may not be as famous as Fox Farm, but it’s gaining attention with fans of “super soil.” This organic soil mix relies on compost to give it higher traces of bioavailable nutrients and bacteria.

According to Purple Cow’s founders, you won’t need any supplemental nutrients when planting your cannabis in this “living soil.” That’s right; just water your soil, and watch your plants grow! While IndiCanja Living Soil may be too intense for seedlings, it should be all you need for mature plants.

Experienced cannabis growers who are curious about “super soils” may want to experiment with Purple Cow’s Living Soil. While IndiCanja may not replace a DIY super soil, it’s far more convenient to try at home.

Roots Organics Formula 707

  • Suitable for large-container plants
  • Indoor or outdoor
  • Sizes: 3, 10, and 20-gallon bags
  • Organic
  • Price: ~ $40 – $75
  • less nutrient-dense formula tailored for advanced growers
  • low-nutrient potting soil that’s ideal for growers who enjoy mixing DIY formulas
  • formula 707’s packaging doubles as a pot

Forget about the ingredients for a second; Roots Organics’ Formula 707 has one of the most fascinating packages. These large container bags could double as your cannabis plant’s pot. Simply cut off the bag’s top and put your plants in. Talk about convenience!

But Formula 707 is way more than its unique container. While this soil mix has fewer nutrients than other formulas, that’s on purpose. Roots Organic intended this formula to accommodate advanced planters who like to make DIY mixes.

You should have some experience adding fertilizers and amendments like perlite before opting for Formula 707. While this may not be optimal for beginners, it’s a worthy choice for cannabis cultivators who crave control.

Mother Earth Coco Plus Perlite Mix

Suitable for potted plants
Indoor or outdoor
Sizes: 27 lbs.
Not organic
Price: ~ $75

  • pre-mixed formula of coco coir and perlite helps balance out drainage and water retention
  • high coco coir formula that gives home-growers optimal control
  • pre-mixed with 30 percent perlite for improved drainage

Like Fox Farm’s Coco Loco, Mother Earth’s Coco Plus Perlite Mix is an excellent choice for coco coir cultivation. This formula has the extra benefit of ~ 30 percent perlite, a useful component of soil which massively improves drainage, water retention and aeration.

While this formula is pretty “bare bones” (literally), that may suit growers who prefer adding macro and micronutrients. Indeed, anyone who struggles with “nutrient burn” may enjoy the superior control Mother Earth’s Coco formula provides.

Also, using coco formulas allows you to “test the waters” before opting for a hydroponics setup. Since coco coir is essentially an inert medium, it gives cultivators a taste of what hydroponics growing is all about.

What soil type is best for growing cannabis?

A quick tour of online weed forums will reveal many heated debates over the “best” soil for cannabis. While every master breeder has their preferred potting mix, there’s no such thing as the “best soil for growing weed.”

There are, however, some traits that all of the best soil mixes for cannabis share. Home-growers should consider key features such as:

What’s the ideal cannabis soil texture?

In terms of soil texture, cannabis prefers the “golden mean.” What we mean is that marijuana likes soil that has a fair balance of aeration and cohesion. Indeed, most cannabis forums describe the optimal soil texture as “loamy.”

Technically, “loam” combines three soil varieties: clay, sand, and silt. While you could use sand or silt on their own, they tend to be too extreme for optimal cannabis growth.

Sand is great for drainage, but poor at water retention. Silt is just the opposite. So, by merging these soils with water-retaining clay, loam offers an ideal balance for maturing marijuana plants.

It is common for cannabis growers to combine mediums such as coco coir or peat with additions such as perlite, lime, and organic matter (e.g. compost) to recreate the beneficial properties of loamy soil. 3 4

What about nutrient levels?

Cannabis plants require significant nutrients (minerals) to support their rapid growth during their one-season life cycle, and this is why they thrive in highly fertile soils. Generally the main minerals affecting cannabis plant growth are nitrogen (N), phosphorus (P) and potassium (K), but other many macro and micronutrients are also important to plant health. 5 6

Thankfully, cannabis can handle a wide range of nutrient levels without serious negative effects on plant growth and a major benefit of using soil is that it has greater buffer capacity over hydroponics.This means it’s less likely you’ll over- or under-feed your weed versus hydroponics. 7

Cannabis plants require different nutrient compositions at each stage of plant growth, i.e., propagation, vegetative and flowering. In other words, baby plants don’t need the same nutrition as teenagers do, and that too is different from what mature plants need to thrive.

Cultivators should evaluate how many fertilizers are in their soil mix and should also avoid time-released nutrients, as these can seriously disrupt a growing operation.

Generally, the more nutrients there are, the better drainage you need for your plants. While you want your plants to absorb nutrients, you also want to make sure they’re not getting overburdened with a build up of nutrients. Some growers “flush” out excess nutrient minerals during the final two weeks of flowering. 8

It’s common for new cultivators to overfeed their plants, especially when using soil. To avoid this common temptation, novice gardeners should start with soil mixes with minimal fertilizers.

What’s the perfect pH for cannabis soil?

Evaluating a soil’s pH is just as significant as checking out its texture. Cannabis roots cannot absorb nutrients if the pH ratios are out of whack.

While the optimal soil pH for cannabis has not yet been studied in the scientific literature, the common ranges of pH used in the cannabis industry are 5.8 – 6.2 for hydroponics, and 6.8 – 7.2 for soil. 9 10 Jin D, Jin S, Chen J (2019) Cannabis Indoor Growing Conditions, Management Practices, and Post-Harvest Treatment: A Review. American Journal of Plant Sciences 10: 925-946 11

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While many soil companies will advertise their soil as “pH-corrected,” cultivators should always double-check these claims. Use a high-quality pH monitor to verify your soil will support healthy nutrient absorption.

How much soil do you need for cannabis plants?

While examining what’s in your soil is crucial, you also must consider how much soil you need. Nobody likes to have a big bag of unused soil sitting around in their space.

On average, home-growers use a three-gallon pot for each cannabis plant. In this case, most cannabis cultivators recommend about 1.5 cubic feet of soil for three cannabis plants in these containers.

Keep this average ratio in mind when evaluating how much soil to stock up on.

What’s the best soil for autoflowers?

Thanks to their ruderalis genetics, autoflowering seeds are tougher than most photoperiod strains. In fact, many cultivators claim it’s not good to pamper auto seeds with well-fertilized soil. That’s because autoflowering varieties are usually short in stature and have a shorter life cycle.

If you opt to use nutrient-dense soil formulas, it could easily cause “nutrient burn.”

Autoflowering fans should stick with simple potting soil for the best results. Some cultivators also express great success using a mix of peat moss, coco coir, and a bit of perlite for their autos.

Remember autoflowers don’t grow as large as regular cannabis strains. Be sure to factor in your auto’s average height before purchasing a bag of soil.

So, what’s the best soil for marijuana? You choose!

As you start “digging” through all the soil brands online, you’ll find so many options to choose from. From nutrient-dense “super soils” to inert coco coir formulas, there’s no “set soil” for cannabis cultivation. Indeed, finding the ideal soil for your cannabis grow operation will depend on your preferred growing style and the type of plant you’re growing.

Anyone new to cannabis cultivation should probably opt for a simple potting mix. While these may not give the “best results,” they tend to be the most forgiving. As you figure out your preferred growing style, you may want to experiment with flaming “hot” super soils or virtually inert coco coir mixes.

Just remember to constantly track the basics like pH, aeration, and water retention when experimenting with cannabis soils. No matter how advanced your soil claims to be, it will not work if these metrics aren’t in order.

What is the best soil for cannabis growing?

If you’ve thought about growing, you’ve probably already thought about the best soil for cannabis.

You likely didn’t give it that much thought, though, because who takes time to think about soil?

Well, the soil that you grow your marijuana in is very important, so if you want to grow the best weed possible, you should pay some attention to it.

This guide will cover everything you need to know about the common growing medium.

How to choose the best soil for marijuana plants:

The basics of using soil for marijuana grows

Plants typically need three things to survive: water, light, and soil.

Soil may seem obvious, but nowadays, with soil alternatives and hydroponic growing, even that is optional.

However, for most growers, especially those who are new to growing marijuana, growing in soil is the best option.

Soil growing (instead of growing in nutrient-infused water) is one of the easiest and most familiar methods of growing.

Plus, attempting to grow hydroponically the first time you are growing marijuana is almost guaranteed to be a recipe for disaster.

Soil is simply the natural way to grow, but it is still important to start with a good quality soil.

After all, it provides the plant’s nutrients and helps the plant form stable roots.

High-quality soil is especially important for outdoor plants who could face potentially harsh winds and other environmental conditions.

Why grow marijuana in soil?

Great soil can help your plants thrive, so it is essential to first understand what soil is.

It is definitely more than dirt.

Advantages of using soil

The soil is the most natural medium for growing almost all kinds of plants. It means that most people already are familiar with or have experience in doing it.

In effect, it is easier and less stressful to use than other modes of planting, which requires a learning curve.

Another advantage is its simplicity in making it work. Just watering the soil is enough for most plants to grow.

Also, the supplies needed are few compared to using other costlier mediums.

Natural soils are made up of mineral particles, air, organic matter, water and biological organisms.

Disadvantages of Using Soil

Since soil is an organic material, it is natural for bugs to live in it.

Therefore, the plants are more prone to suffer from pest infestations.

There is also the issue of slower growth.

In contrast, marijuana grown using hydroponics enjoys explosive growth due to faster and more efficient nutrient absorption.

Nearly 25% of soil is air that exists in a gaseous phase –not quite liquid or solid.

Water

Water is known as soil solution, a liquid made of water, and ions from dissolved salts, and chemicals.

These ions are unable to attach to minerals in the soil.

Water also makes up nearly 25% of soil. The mineral particles in soil consist of sand, clay, and silt.

These inorganic particles can significantly impact a soil’s quality.

These tiny fragments of rocks and hard minerals (such as quartz) do not carry any nutrients, meaning large amounts of it in your soil is a bad thing.

Soil with lots of sand is arid;

however, small to moderate amounts can improve drainage and aeration as well as increase tilling quality.

This mixture of sand and minerals has some nutrients, but not many.

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It is is beneficial for soil, as it can include the important nutrients of K, Ca, Mg and Fe- making soil fertile.

Clay is aluminum-silicate and has negatively charged ions that attract these nutrients to it.

However, if there is too much clay, it will be hard to till the soil, and there will also be poor drainage.

Soil also includes a variety of organic matter and substances such as:

  • Decomposing plant and animal particles
  • Organisms and microorganisms living in the soil
  • Substances produced by roots and microorganisms

These exist in smaller amounts, typically around 5%. Although there isn’t much organic matter in soil, its presence highly influences its quality and the eventual yield of your plants.

The particles and substances are also known as humus, whereas organisms may include earthworms and other beneficial creatures.

How to recognize the best soil for cannabis

Now that you understand what soil is, it is much easier to recognize good soil when you see it.

Marijuana soil has some specific requirements, so unless you are buying soil that is specifically designed for cannabis, you’ll want to learn to pay attention to certain things.

Good soil will have the correct texture, drainage ability and water retention for marijuana. It will look dark and rich, with a loose texture that isn’t muddy.

Good marijuana soil also drains well – you should be able to pour water on it and have it drain out within a few seconds.

The soil should retain enough water for the plant to thrive, as the roots need that water, but it shouldn’t be so much that the roots cannot get enough oxygen either.

This is why both proper drainage and water retention are essential aspects of good soil.

Good soil also has good ingredients. Of course, soils that include some form of organic matter (humus) are great for marijuana because they provide plenty of nutrients.

Some examples of organic matter to look for in a good cannabis soil include:

  • Earthworm castings
  • Bat Guano
  • Blood, fish, or bone meal
  • Kelp
  • Mycorrhizae
  • Perlite
  • Pumice
  • Sandy Loam
  • Dolomite lime

If you purchase soil that has any of these ingredients in it, there’s a good chance it might provide great nutrition for your plants.

You’ll still want to make sure that it has the right nutrients for your plant’s particular stage in its life cycle though.

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Choosing soil for your marijuana plants

With an understanding of what you are looking for, you can now start to select the right soil for your plants.

The first thing to remember is that soil is highly dependent on the stage of life that your plant is in.

While it is still sprouting, it is best to use peat plugs or something similar to that.

These ready-made blocks of soil provide everything that a budding seed needs to make its way into the world.

If you can’t find, (or don’t want to use) peat plugs, an organic potting soil will also work.

Organic soils will not have any added ‘slow-release’ chemicals, something you’ll want to avoid when growing marijuana.

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While potting soils do not have the right type of nutrients to support a growing marijuana plant, they will have enough to support a seedling for its first couple of weeks.

After that point, you’ll want to supplement with nutrients that are specifically designed for marijuana plants – especially once you reach the flowering stage.

Another reason why it is okay to use potting soil (at least at first) is because you’re likely going to end up moving your plants after they are about a month old anyway.

The roots will be too big for their first home, and you should place them in a bigger container or move them outdoors.

That is the perfect time to switch out your soil for something more suitable.

If you used peat plugs, you can simply add the plugs to local dirt or grass mulch to make a suitable soil outdoors.

Not only does this provide a better texture over the natural earth, but it also offers ample room for young roots to move around and increases the nutrient value in the soil.

You can also move your seedlings into either sterilized potting compost or a “living soil.”

If you opt for sterilized soil, it should include some form of amendment (such as perlite), that makes up at least 20% of the soil.

This additive will help increase the amount of air present in the soil, which helps marijuana plants grow faster.

Living soils, on the other hand, are composted soils.

They are useful because they include microorganisms that create an ecosystem similar to the best natural scenario.

The roots directly absorb the nutrients produced from these organisms, and the results are often noticeable in the flavor and scent of the harvest.

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