Feminizing Cannabis Plants
If you maintain all of the above recommendations, you should have 60-70% females. If you want to achieve 70-100% female plants from seeds, read some more advanced tips:
Use more Nitrogen; you get more females when you have a bit more Nitrogen and less Potassium. If your Potassium levels are higher, you will get more male plants. A bit more Nitrogen is better for the vegetation cycle anyways.hello
Make sure your humidity levels are high right from seed with a humidity dome. If our humidity levels are low, you will get more males. Also prevent your soil from drying, this will create more males.
Temperature does have a bit to do with the strain background. Unless your growing an exotic Thailand Sativa strain that loves the heat around 85 degrees, try to keep the temperatures lower. High heat creates stress on the majority of strains people grow, and make more males. Keep your room temperature as close to 70 degrees Fahrenheit as possible, and make sure it does not drop by more than 5 degrees when the lights are off, or you will create more males. Keeping the relative humidity of the room at 70% is optimal for females to form. Higher humidity’s over 80 and under 60 will create more males.
Do not top your plants or take clones before sex is shown, this will add stress and create more males.
Use a Metal Halide (MH) during vegetation and a High Pressure Sodium Bulb (HPS) for flowering. This will create more females.
Before you change the light cycle from it’s vegetation to it’s flowering, be sure your plants are stress free. If you recently overfertilized, or treated the soil for mold or plant for pests, wait a few days for the plants to overcome that stress, then go into the flowering cycle, even if it throws your schedule off by a few days, it’s well worth it as you may get 20% more females simply by waiting the extra 3 days for them to recover from the stress.
It’s also best to vegetate under 14.5 hours of light for optimal female ratios. If this cannot be done, then use 16. And if you’re still in too much of a hurry, use 18, but never 24 hours of light or you will have too many males. You get more females using 14.5 hour of light during the vegetation cycle, slightly less using 16, slightly less at 18, but your chances dramatically decrease if you use 24 hour light. You could end up with 70% males, or 100% male plant, that means NO FEMALES AT ALL. It’s not worth the risk, especially if you’re growing higher end genetics.
Female and Feminized Seed