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what percentage of cannabis seeds are female

If you run the 24/0 photoperiod then do not allow those temps to go anywhere above 85F unless you have an equatorial strain. 75F is the best but going a little lower is not a problem for helping those female ratios. If you can get in at around 65F then those females are going to be popping up all over the place. The problem with this is that some growers like to use the 18/6 photoperiod and when the lights are off the temps drop from around 65F to 50F and even less. Try not to be below 55F because this has the adverse effect on the plants producing more males than females. Again between 65F and 75F is where you want to be during the 3rd to 4th week of vegetative growth, the preference being 70F.

In November 1998 we introduced our “Female Cannabis Seed”. We did this after our own experiments showed that from female cannabis seed, we acquired almost 100% female off-spring.

Weed growers who are growing in non-stressful conditions will never see the male effect from feminized cannabis seeds and so hence it does not exist for them. However over periods time and different weed growing techniques the marijuana grower will eventually see these results when growing in less than optional environments. MALES!

From literature and from our own findings it appears that the growth of a male or a female cannabis plant from marijunaa seed, except for the predisposition in the gender chromosomes, also depends on various environmental factors. Not only the origination of entirely male or female marijuana plants is partly affected by these environmental factors, the number of male and female cannabis flowers on a hermaphrodite plant is affected as well.

No stress during the 3rd to 4th week of vegetative growth. That is all there is to it. If you got your garden growing in optimal conditions without marijuana plant stress then the impressive 90% to 95% females start to emerge from standard cannabis seed packs. I find that topping is best done at the second to third week of vegetative growth but that this is a little stressful and can lead to those female ratios dropping again. Avoid topping or pruning if you are looking to up the female count.

Apparently environmental influences affect the sex of the female cannabis seeds as well. Because of the fact that Female marijuana seeds do not grow into female marijuana plants under all circumstances. Thus we changed the name from “Female Cannabis Seeds” into “Feminised Cannabis Seeds”.

Invest in a MH Light for vegetative growth. Dump the HPS bulb for flowering later. I have noticed that HPS lighting during vegetative growth simply sends those males to female ratios all over the place. With MH lamps the females are everywhere. Invest in some MH HID lights. It makes all the difference in getting those females to show more often. This is worth repeating! MH Bulbs produce more females under optimal conditions especially if they are present during the 3rd and 4th week of vegetative growth. Surprising enough you can start seedlings under HPS and it will not have an effect on those female ratios. Again the 3rd to 4th week of vegetative growth is what is important here.

Flowering: Decrease humidity slowly to 40–50% during the flowering phase. Refrain from dropping to this level in one go. Gradual humidity reduction will prevent stress. Too high humidity can cause numerous problems for cannabis flowers. By now, the sex of the plant has been established from the specialized treatment during the vegetation phase.

Shorter day length does slow growth during vegetation, but the likelihood of females increases to 70–100%. With expensive primo seeds, it is better to allow an extra week of vegetation to get the best value. Some patience during vegetation is preferred to throwing half the crop away later on.

There are techniques and tricks of the trade that can be used for increasing the likelihood of getting more females from regular seeds. The key words here are a “stable growing environment.” Stress tends to produce more males, and undue stress during flowering can turn plants intersex.

HIGHER HUMIDITY AND MOISTURE IN AIR AND SOIL

Light that is in the blue spectrum during vegetation promotes female development. Fluorescent lights should be white or blue spectrum for infant plants. Refrain from using the purple/red-tinted fluorescents, which are better for flowering.

Following these easy-to-maintain tips can maximize female plant development. Stress of any kind is the enemy of marijuana. It is thought that male development increases the likelihood of pollination during times of stress. A single, well-pollinated female can produce hundreds of seeds, perpetuating the species into the next season.

The other downside of 24hr light exposure during vegetation is poor root development and interrupted gas exchange in the rhizosphere. Root development occurs predominantly at night, and necessary oxygen exchange occurs more efficiently at this time too. Healthy roots mean healthy plants.

Pubescent plants: Maintain humidity at 70% RH. Use a hygrometer religiously to ensure ideal moisture content of the growing medium. Maintaining correct humidity is made easier with a humidifier/dehumidifier unit always at work in the grow space. Continue to monitor the moisture content of the grow medium. Overwatering and overdrying are stress vectors that can encourage males.

I think the breeders already thought of that, that’s why it’s about 80-90% cheaper to buy the fems than 2 packs of regulars.

>>> And what about “feminized” seeds? Are they 100% garnettted to be a female plant or is it close to 100%?

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All creatures tremble when faced with violence. All creatures fear death, all love life. If we can only see ourselves in others, then how could we possibly hurt another creature?

As I was eating a banana for breakfast this morning I remembered the chemical I was thinking about that could induce the female sex: ethylene. I believe ethylene gas is a byproduct of banana peels as they sit out, and this reminded me of it.

Thanks for your help,