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Feminised seeds grown indoors, 100% female plants

There are several ways to secure that a female plant produces pollen, and almost all of them require some type of chemical that is often sprayed on the plant. Once sprinkled with the chosen product and under a flowering photoperiod, the plant will flower normally, but as a male instead of female, producing ‘feminized’ pollen (which only contains chromosomes XX) that can be used to pollinate other females in order to produce seeds. These are some of the most commonly used techniques:

STS or silver thiosulfate solution

The problem with monoecious hermaphrodite plants has more to do with the parents used (and if they exhibit any hermaphrodite trait) rather than with the type of seeds produced. If to create a feminized seed you use a female plant with a tendency to produce male flowers, part of its offspring will likely inherit that characteristic, whether the said female plant is used as a pollen donor (after reversing its sex) or as a recipient of pollen (letting it flowering as usual). Yet the same thing happens when producing regular seeds: if the male or female parents are not stable in this respect, neither will be their offspring (or at least part of it).

It is important to mention that you must not consume any part of the plants sprayed with this type of product, although that would be weird, as the plants have “become” males and won´t produce any buds. Nevertheless, you shouldn’t use the reverted plants to make resin extracts; the best thing is to discard them after harvesting the pollen. Both components, sodium thiosulphate and silver nitrate, are also used for photo-development.

This is another lie that some people believe. As it’s been mentioned before, a female plant is sprayed with some chemicals in order to inhibit its ethylene action. After a few weeks of this and once in the flowering period, the plant will produce male flowers and pollen, which will be harvested to pollinate the female plants designated to produce seeds. Once the seeds are formed, they are collected and packed immediately, so they don’t come into contact with any chemicals or the plants that produce seeds, nor, of course, with the seeds themselves. Also, to produce cannabis seeds, you normally need two separated indoor cultivation areas, one for the reverted plants (treated females) and the other for the females to be fertilized to produce the seeds, so the latter can’t get “contaminated” with any chemicals.

The result is a female cannabis plant capable of pollinating other female specimens. As a result, the fertilised plant produces seeds in the buds with feminised DNA that give birth to other female plants (99% probability).

This product is neither toxic nor corrosive. Besides, it is commonly used for the treatment of burns, for digestion, and as an antiseptic. The best concentration of colloidal silver for the above purpose is 15 ppm, even better if increased to 30 ppm.


After harvest, feminised seeds should be stored in a cool but not damp place to dry properly. After 2 weeks the seeds can be kept refrigerated to maintain their vitality over time.

The best way to collect pollen from the marijuana plant treated with colloidal silver is to cover the entire sample with a plastic bag (perforated at the top to facilitate air exchange) so that the spores settle to the bottom.

As you have read, it is not easy to produce feminised seeds by hand and, above all, it is forbidden in The UK. However, it is legal to possess cannabis seeds for collection or food purposes.

In human embryos, a single X chromosome and a single Y chromosome denote a male (XY). Two X chromosomes denote a female (XX). The combination of genetics from egg and sperm create a diploid cell, containing two chromosomes.

With best wishes,

Related post

So as the understanding of cannabis cultivation has it, both nature (genetics) and nurture (growing conditions) influence the sex of the cannabis plant. But how exactly does this work?

I was told I bought a clone of a female plant, however my sister who grows saiid it looks male.
If I take a picture would anyone be able to identify its gender?
First time grower!

When plants are kept in the correct optimum environment for their genetics, there is generally a small likelihood of hermaphroditism unless the seed is genetically prone. This is why growers must pay close attention to the cultivation environment to avoid hermaphroditism.