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how to harvest seeds from marijuans

After the whole process of germination, growth and flowering, a lot of growers ask themselves when to harvest Marijuana seeds. Usually, the breeders will include a suggested flowering time for each strain, but as a rule of thumb, Indica marijuana plants harvest in 6-8 weeks while Sativa Marijuana plants take 10-12 weeks.

You can also judge the ripeness of the Marijuana by taking a look at the trichomes; or little hairs/crystals on the flowers and surrounding areas of the Marijuana plant. If they are transparent its still too soon, if they are milky white they are ready and if they turn brown they have become over-ripe. It is also advisable to follow the instructions to harvest Marijuana seeds on the packet since most reputable breeders also have a tried and tested flowering time for optimum ripeness, potency and flavour of a Marijuana strain.

Look for these signs for when to harvest Marijuana seeds

If you meant when to harvest seeds from cross-pollinated Marijuana plants, then the seed will fall from the flower by itself once it is mature and ready to germinate into another Marijuana plant. Usually, as a best practice to harvest Marijuana seeds, some growers wait for the whole flowering cycle to end just as if they were harvesting the flower.

You might find our FAQ Submission How Do I Harvest My Plant? useful

In our experience, the buds on the upper branches become ripe and ready for harvest faster. Therefore, we may choose to cut the main stalk about halfway up – in order to remove the top portion of the plant only – or cut off individual upper branches first. This will provide more time and sun to reach the lower flowers, and allow them to fatten up for another week or so.

One plant broken down into individual branches, hanging to dry from a “clothes line” in our spare room. Note that we keep the window covered with a dark sheet to block most of the light. The top image is just to show the set-up. We also use an herb drying rack to set any loose buds or smaller branches on. Yes, it does smell quite strong in the room! Yet with the door closed and a towel stuffed below the door, it prevents the whole house from smelling.

What About Flushing?

You know all those shiny, sticky, wonderful-smelling crystals you can find all over your cannabis flowers? Those are trichomes. They play an important role in the plants natural defense mechanisms, and also contain the thing we’re all after here – cannabinoids.

As a general rule of thumb, when the trichomes are very clear, the cannabis plant is still immature and the THC is less developed. Harvesting cannabis at this stage may result in a more speedy, racy, less smooth and comfortable user experience. When the trichomes change from clear to fully cloudy, that is when we like to harvest cannabis. Or even a tad later, as described in the “when in doubt” bit below. This is when the buds are now at a very well-balanced stage of development.

However, many home growers and most commercial growers use chemical fertilizers and pesticides that get absorbed into into the plants vascular system, and in to the buds. Those plants will require a “flushing” period. This is where the plants root ball and soil is repeatedly flushed with water for about two weeks prior to harvesting, to help rid the plant of built up chemicals and salts. If not flushed, the bud will burns really harsh and tastes unpleasant. Hmm… I wonder why? If you need instructions on flushing, see this article.