How To Store Weed Seeds

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Storing cannabis seeds under the right conditions lets you keep your favourite strains for a long time. However, doing this incorrectly can lead to a If you have some cannabis seeds but are not ready to plant them yet, you need to know how to store them properly. Here's our complete guide. Handy dos and don’ts for storing cannabis seeds. Following these tips should keep their germination rate unchanged for at least two years. Read more!

How to store marijuana seeds

Storing cannabis seeds under the right conditions lets you keep your favourite strains for a long time. However, doing this incorrectly can lead to a series of issues that end in the same result: the seeds won’t germinate. Here we analyse exactly what you need to do to keep your marijuana seeds in good condition, thereby making sure that they germinate successfully even several years later.

In order to store your marijuana seeds for a long time, it’s important to remember that they are technically classified as living organisms, because they have an embryo that is capable of germinating and becoming a new plant. And, like every living organism, your seeds can die if you don’t look after them properly.

Even though they’re quite hardy, if you don’t provide them with the suitable conditions for their correct conservation, their viability will rapidly decrease. Whilst its typical for them to germinate within 48 to 72 hours, they can take as long as 6 to 7 days if they’re stored badly. Or at worst they might not even germinate at all.

There are several factors to take into consideration that can reduce the germination rate of marijuana seeds: light, heat, humidity, and oxygen levels. As a general rule though, the most important factor to keep your seeds viable for as long as possible is to avoid fluctuations in the environmental conditions.

How to store marijuana seeds?

These are the key parameters to correctly store your cannabis seeds for the maximum time possible:

1- Exposure to light

The shell plays a part in protecting the seed’s embryonic tissue from the light, which in turn helps the seed remain dormant. In nature, cannabis seeds normally fall from the plant in autumn and remain under a light layer of soil until they germinate the following spring. Therefore, they haven’t evolved to face bright light, which may trigger the chemical processes needed for germination. Storing your cannabis seeds in a dark, opaque container is a great way of keeping top germination rates for the future.

2- Humidity level

High relative humidity levels are required for the germination of cannabis seeds. Therefore, it makes sense to keep them under low humidity conditions when they’re being stored. If you’re only storing the seeds for a short time (no more than a few months), a relative humidity level between 20% and 30% will be fine. If, however, you’re going to store them for longer, then keep the humidity level between 8-10%.

A good way of making sure that the seeds remain dry is to include a desiccant in the container where they’re being stored (i.e. one of those little silica gel packs that are often included with different products). These packs also absorb any excess of ethylene that may have been generated as the seeds get older and that could also stimulate germination if not removed. You can even use a few grains of rice if you don’t have any silica packs available.

3- Temperature fluctuations

When it comes to storing cannabis seeds, the cooler the better. But only to a certain point. At low temperatures, the life of cannabis seeds is significantly prolonged because the cold temperature slows down cellular biochemistry and so the plant’s delicate living tissue can survive for much longer periods. Another option is to freeze the seeds to keep them for the long term; but if this process is not carried out properly, they can eventually get damaged.

So the ideal storage temperature ranges between 4° and 8°C. You can still store seeds at higher temperatures, but their lifespan will be reduced. Many growers stick to temperatures around 4°C. However, this still isn’t a magical number.

4- Oxygen level

Although this isn’t such a determining factor, a constant supply of fresh oxygen can lead to premature germination. To prevent this, keep your seeds in a bag or airtight container, ideally vacuum sealed, although as long as the container is tightly closed that should be enough.

What’s the best way to store cannabis seeds?

There are different options depending on how long you’re intending to keep the seeds. According to the requirements mentioned above, it’s best to keep them in a dark, cool, and dry place. These are the basic conditions you can find in a standard cooler or fridge (ideally ‘no frost’ so they’re protected from the damage that frost may cause). A piece of warning here: you can’t be opening and closing the fridge door non-stop.

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This is why it’s best to have a fridge specifically dedicated to seed storage. Or at least a small cooler that you rarely open; because every time you do this, the inside experiences rather significant fluctuations in temperature and humidity levels.

If you don’t have another choice, at least place the seeds towards the back of the fridge, or, even better, in one of the fruit and veg drawers, where they’re more protected from these changes. If you place some desiccant in the container with the seeds, you’ll also be protecting them from any changes in humidity.

In case you don’t have a cooler at hand, you can always store your seeds in a cool basement. Even a normal room can work well: a seed pack stored in an airtight container in a drawer or cupboard in a dark area of the house should also offer good germination rates. But do avoid storing your seeds in bright light or in hot areas (such as a windowsill or your grow room).

If you normally germinate your cannabis seeds a few weeks or months after purchasing them, you don’t need to be so strict with how you store them. You’ll be fine as long as you keep them in a cool place, away from the light, and in their original packaging (which is already optimised for their protection); and, of course, follow your common sense regarding these storage rules. If you open a packet of seeds but you don’t sow all of them, keep the remaining seeds in an airtight container.

How long can you keep marijuana seeds?

Generally speaking, always look for proven quality seeds like the ones we offer you in our Kannabia catalogue: if you provide them with all the ideal conditions that have been described, you can keep your seeds for as long as 5 years after they’ve been produced. In addition, if you maintain decent storage conditions over time (i.e. without significant fluctuations in the environmental parameters), you can expect your seeds to still be good after one or two years.

Naturally, the longer you keep your marijuana seeds, the lower the chances of a successful germination. Storing them incorrectly also reduces the possibilities of success. So store them properly, as we have described in this article, and use them as quickly as you can, to ensure the highest possible germination rate.

Kannabia Seeds Company sells to its customers a product collection, a souvenir. We cannot and we shall not give growing advice since our product is not intended for this purpose.

Kannabia accept no responsibility for any illegal use made by third parties of information published. The cultivation of cannabis for personal consumption is an activity subject to legal restrictions that vary from state to state. We recommend consultation of the legislation in force in your country of residence to avoid participation in any illegal activity.

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How to Properly Store and Preserve Cannabis Seeds [Explained]

If you don’t begin with great seeds, you can forget about producing a harvest of high-quality marijuana. A lot of growers seem to forget one simple fact: Your seeds are alive! Although cannabis seeds are fairly durable, improper storage can ruin them. If you’re paying $10-$20 a seed, losing a full batch is an expensive mistake.

Before your marijuana seeds germinate, they are in a similar state to animals when they hibernate. Like all living organisms, your seeds can die if you don’t take care of them correctly. The good news is that cannabis seeds can last for five years after harvest with proper storage.

In this guide, we outline how to store and preserve your cannabis seeds. We focus on the following:

  • Light
  • Temperature
  • Humidity
  • Storage
  • Insects & Pests
  • Germinating old seeds

EDITOR’S CHOICE – Homegrown CannabisCo

Homegrown CannabisCo are the masters when it comes to seeds. Offering a massive variety of cannabis seeds that are well categorized, not only does this company create a resource for superb quality options including feminized seeds, it also provides extensive growing information for those looking for some support along their journey.

Keeping Light Away from Your Marijuana Seeds

You must keep your seeds in a location that is cool, dark, and dry. It is best if you keep the seeds in their original packaging. When they are exposed to temperature changes or light, cannabis seeds begin using their store of nutrients. This is a disaster because they ultimately won’t have the nutrients to germinate.

When they are exposed to temperature changes or light, cannabis seeds begin using their store of nutrients.

Make sure your seeds remain away from light, as it can directly trigger germination.

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What’s the Right Storage Temperature?

The best temperature to store your cannabis seeds at is between 43- and 47-degrees Fahrenheit. The lower the temperature, the less likely your seed is to germinate unexpectedly. Experienced growers tend to have special refrigerators to store their seeds. Ideally, your fridge is a no-frost model. If you can place the seeds in the fruit and vegetable section, that is even better.

Another option is to freeze the cannabis seeds. If you go down this route, please ensure that you vacuum pack them first. Then put them in a dark container. Also, it would help if you germinated these seeds immediately once they come out of the freezer. Don’t allow them to thaw first.

What About Humidity?

Here is a quick overview of what will likely happen to cannabis seeds at different humidity levels:

Your cannabis seeds need a certain level of moisture for germination. If the humidity level gets too high, your seeds will rot in storage. An extremely low level of humidity of around 8-10% is suitable only for long-term storage. If it drops below 8%, you offer any insects present in the seeds the chance to become active and start reproducing.

The Right Storage Options for Your Cannabis Seeds

You now understand that you must store the seeds away from direct light. We have also outlined the need for relatively low humidity and a refrigerator-level temperature. Different options are available depending on how long you intend to store the seeds.

Short-Term

If you only require short-term storage, a dark drawer or cupboard is sufficient. The most important thing, regardless of the duration of storage, is to avoid temperature and humidity fluctuations. Rapid variations in temperature, in particular, can destroy your seeds. If you live in a location with warm daytime temperatures and cold nights, avoid outside storage.

For short-term storage, place the seeds in a container with desiccant. Seal it, and place it in a cool, dark place.

Medium-Term

Once you enter medium-term storage (a few months), it is time to use an airtight container. Examples include a mason jar or Ziploc bag. Place this sealed container in the fridge. Remember that opening your fridge can cause significant temperature fluctuations. As a result, it is ideal if you have a second fridge that is seldom used.

Also, you should note that modern fridges have low humidity levels. If the humidity is too low, your seeds will begin using up nutrients.

Long-Term

If you want to store your seeds for at least six months, use a vacuum-sealed container. You can achieve this effect by removing all the air from a Ziploc bag. There are also special vacuum-sealed containers available online. Put the sealed bag in a dark container and put it in the fridge.

You also have the option of placing the seeds in the freezer. Remember, though; you need to germinate them immediately upon removal.

A Note on Insects & Pests

Imagine paying $100+ for seeds, going to the trouble of storing them, only to find that insects ruin them. Unfortunately, all you need is one insect in a container to destroy all of your seeds. The first consideration is to avoid exposure to ultra-low humidity. However, for long-term storage, this is precisely what you are supposed to do!

One option is to spread diatomaceous earth (D.E) where you store them. This is a type of sand that has a fossilized algae base. Crucially, for our purposes, it serves as an excellent natural insecticide. Unfortunately, you shouldn’t use D.E if you plan to store your seeds in a fridge with other food.

Imagine paying $100+ for seeds, going to the trouble of storing them, only to find that insects ruin them.

It would help if you also stored your seeds as high above the ground as possible. This reduces the possibility of a pest like a rodent coming in and feasting on the seeds.

Insects and pests also thrive in dirty storage areas. As a result, you must ensure the storage area remains clean. Otherwise, you won’t just attract pests to your seeds; microbes will form and damage the seeds. Do you want to consume marijuana from contaminated seeds?

Germination

You can ‘test’ your seeds once you have removed them from storage. Place them in water. If they sink, they should be fine. However, if they float, it is more likely that they are bad seeds. You can still try to germinate, but there is a greater risk of producing poor-quality cannabis, or else the seeds fail to sprout. You can keep floaters in water for approximately 72 hours to see if they sprout a tail.

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If you have old seeds not stored in ideal conditions, there are still a few ways to germinate them.

  • Remove the hard ridge with a sharp knife.
  • Soak the seeds in carbonated water with germination booster, fulvic acid, or hydrogen peroxide. Use room temperature water, and perform this pre-soak for at least 12 hours in a dark area.
  • Scratch the tough outer shell with sandpaper. Believe it or not, this process could help warmth and moisture get inside. This process is called ‘scarring’ and should happen before you soak the seeds.
  • Make a small cut into the shell as a last-ditch attempt to get it to sprout.

Final Thoughts on Storing and Preserving Cannabis Seeds

If you purchase marijuana seeds and intend to use them almost immediately, you should have no issues. Even so, it is probably best to keep them away from direct light. In the short-term, a dark cupboard is sufficient as long as the temperature and humidity are reasonable.

Once the goal is to store cannabis seeds for months rather than days or weeks, everything changes. You need an airtight container, which you should store in a fridge. Include a vacuum-sealed container if you plan to store the seeds for several months or longer.

When storing cannabis seeds, you must ensure they are not exposed to germination conditions. This means keeping them away from direct light. Also, store in 20-30% humidity (8-10% for long-term storage) and a cool temperature. Keep the environment clean to avoid pests, and consider the tips above for germinating old seeds.

Storing Cannabis Seeds – Some Handy Dos and Don’ts

Keeping your cannabis seeds safe and viable is essential. To help you get the most out of your “magic beans”, here are some handy dos and don’ts for correctly storing cannabis seeds.

1. DO – keep your cannabis seeds dry.

Damp or wet seeds will begin to germinate, and even small amounts of moisture or humidity inside packaging can cause rot and mould.

2. DON’T – let them get too warm.

Warmth will also encourage germination, and high temperatures can damage cannabis seeds, effectively ‘cooking’ the insides.

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3. DO – keep them in the dark.

Darkness encourages seeds to remain dormant; long exposure to light may damage and degrade the health of the seeds.

4. DON’T – squash them!

Pretty obvious really, but make sure the shells remain intact. The shell is the seed’s natural defence against outside elements.

5. DO – keep them labelled.

Cannabis seeds do tend to all look very similar; make sure your strains don’t get mixed up!

6. DON’T – let them get too cold.

Freezing cannabis seeds will damage at least some of them. The door of a fridge is the ideal temperature (5 – 6 degrees centigrade).

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7. DO – keep your hands, working area and any equipment clean and dry.

Mould and fungus can grow on seeds even when they are refrigerated.

8. DON’T – let pests or rodents get to your cannabis seeds.

Keeping them in the fridge is a good way of ensuring this also.

9. DO – make sure you buy cannabis seeds from a reputable seed bank, such as Sensi Seeds or White Label Seed Company.

Seeds should arrive in the original packaging and be clean and solid.

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10. DON’T – pack your cannabis seeds with NON-FOOD GRADE silica gel.

Or anything else that could be toxic!

Following these handy tips for storing cannabis seeds should keep the original germination rate (which, if you bought seeds from a reliable seed company, should be around 95%) unchanged for at least two years, and potentially as many as five! After some years, the germination rate will gradually decline. However, thanks to the naturally stubborn survival traits of cannabis, there is no deadline at which all the cannabis seeds in a batch will suddenly lose the ability to germinate. Anecdotal reports of cannabis seeds that were over 20 years old when they were germinated and still produced a 60% germination rate can be found on various cannabis forums, so with correct storage, your precious seeds will remain an investment for years to come!

Laws and regulations regarding cannabis cultivation differ from country to country. Sensi Seeds therefore strongly advises you to check your local laws and regulations. Do not act in conflict with the law.

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