One way to avoid sexing plants is to buy feminized seeds (more below), which ensures every seed you plant will be a bud-producing female.
Within a week or so you should see a seedling begin to grow from the soil.
What are feminized cannabis seeds?
Immature seeds tend to be light in color and have a soft outer shell.
To create a dark, protected space, take another plate and flip it over to cover the seeds, like a dome.
These are referred to as “bagseeds” and whether or not you can grow one will depend on where it came from.
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Even if every stage up to harvest has gone splendidly, the final (and most maddening) mistake you can make is harvesting too early or too late. You don’t want to make the chop before your buds reach peak potency, but you also don’t want to leave them hanging, so to speak.
This is usually done when growing hydroponically. Soak the rockwool blocks in low-pH water and place them in a plastic tray with a lid. Place your seeds in the hole of each rockwool block. Seeds should germinate in a few days. Place the rockwool blocks with your seedlings in their soil pots when roots start to come out the bottom.
10. HARVESTING TOO EARLY OR TOO LATE
Most cannabis soils, with the exception of special soil mixes used for propagation and seedlings, are pre-fertilised. This way, you won’t have to administer nutrients until several weeks into the grow. In fact, you may only need to feed nutrients when your plants start to flower. If for some reason your growing medium isn’t pre-fertilised, you will have to give nutrients to your plants from the beginning.
Use some type of absorbent paper (kitchen paper, coffee filter) and place a couple sheets on a flat surface such as a plate. Put your seeds on the paper, spaced a little apart, and cover with a couple more sheets over the top. Moisten the paper and make sure to keep it damp so it doesn’t dry out. After a few days, when the seeds have sprouted 2–3mm taproots, transfer them to their seedling pots.
Fill a glass halfway with lukewarm (22°C) water and drop in your seeds. After about 3–5 days, the seeds should have sprouted, and you can now transfer them (carefully!) into your prepared soil pots.
If you really want to reuse your old soil, you need to amend it with fresh nutrients. Before that, you need to make sure that your soil is free of contaminants.