This is why many North American growers are turning to feminized seeds—cannabis seeds that carry only female genetics, and can be relied on to produce only female plants. By creatively applying technologies to seed feminization, modern breeders like Kannabia can ensure female genetics in seeds with a nearly 100% success rate.
Male vs. Female Cannabis Plants
Both substances are a blend of water and fine silver particles, and they work in largely the same fashion. The silver solution impedes the production of ethylene, a hormone involved in flowering. The result is a female plant, but one that produces male flowers with pollen sacs. Since those pollen sacs develop on a plant with only female genetics, female genetics are all they carry. When those flowers pollinate another female plant (one untreated by silver solutions), the resulting seeds are nearly certain to be female.
How Are Cannabis Seeds Feminized?
Traditionally, the solution to this has been an inelegant one, with many cultivators planting at least twice as many seeds as they hope to harvest with the assumption that about half of them will be useless. However big a harvest you’re looking for, using regular seeds means you’ll have to plant twice that many seeds.
The easiest way to identify sex with unknown seedlings? Cut off a small branch of the plant, stick it in a cup of water with a label, and keep it in a sunny window on a 12/12 light schedule until buds or pollen sacs start forming. As long as the plant is getting bright light in the day and long dark nights, it will reveal its sex in just a few weeks (you don’t even need to wait for roots to form).
This seed is about to burst out of its calyx
Overview: How to Make Feminized Seeds
You can’t see the difference between male and female plants until they start flowering (unless you do a genetic test). Feminized seeds ensure all plants are female so you don’t need to worry about it. You know that every plant is female from germination.
Buds are ready to get pollinated when they look like little bunches of white hairs
Feminized seeds come from two female plants being bred together, causing all offspring to be female (which means every plant makes buds)
Now that you’ve gotten the overview, here’s the feminization process with detailed step-by-step instructions…
Some “feminized” seeds may produce hermaphrodite plants if the seeds are of low quality. High-quality feminized cannabis seeds from reputable seed banks have been bred to not display hermaphroditic characteristics under optimal growing conditions. If you’re looking for a sure thing, carefully consider your cannabis seed source.
Gibberellins are hormones that affect cannabis plants throughout their growth cycle. Some gibberellic acids such as GA3, 4, 5, and 7 can induce the growth of male cannabis flowers when sprayed directly on female plants before the flowering period. Most growers use GA3, the most widely available and effective of the gibberellic acids. Use a solution of 0.1 gram of GA4 per liter of distilled water. Ed Rosenthal recommends spraying the top of plants for five days in a row then changing the photoperiod to induce flowering.
Alternative Methods to Feminizing Weed Plants
Each of these methods should be successful, if used in the right way to produce female marijuana plants. Let’s quickly look at each method briefly.
Growing feminized cannabis seeds has many benefits over regular seeds. For one, growers don’t have to hedge their bets hoping that the regular seeds will produce female plants. Instead of planting more regular strains than needed to get lucky and get enough females for your specific purpose, you can stick with a sure bet using feminized strains. Using feminized seeds can speed up the growing process by eliminating the need to watch out for male plants, saving you time and space.
The Colloidal Silver Method
Feminized cannabis seeds serve a major purpose for commercial and home growers. Feminized seeds can be made by inducing a regular female cannabis plant to grow male sex organs that contain pollen. The hermaphroditic pollen will contain only the female X chromosome and no male Y chromosomes. When used to pollinate a female cannabis plant, the seeds produced between the two plants will inherit two X chromosomes meaning that all subsequent seeds will be feminized.