Maintaining correct humidity is made easier with a humidifier/dehumidifier unit always at work in the grow space. Use a hygrometer religiously to ensure ideal moisture content of the growing medium. Pubescent plants: Maintain humidity at 70% RH. The stress of a too-dry medium will encourage male development. There is a fine line between maintaining a healthy wet-dry cycle and over drying. Make sure the growing medium does not dry out too much. This is easily done with a humidity dome during the infant stage. Young plants: When plants are young, make sure they maintain a high humidity of at least 70–80% RH. Stable moisture exposure in the air and medium promotes females. Similarly, consistent and stable watering routines maintain ideal moisture in the grow medium. High and stable humidity levels from germination right on through to vegetation increases female development. HIGHER HUMIDITY AND MOISTURE IN AIR AND SOIL A potassium-rich nutrient blend will boost the chances of males during the early development phase. Increasing nitrogen (N) slightly and reducing potassium (K) can increase the likelihood of females. INCREASE NITROGENĬannabis plants consume lots of nitrogen during the vegetation phase. These a red biased in their spectrum and imitate the red-shifted light of autumn.
When the 12-12 switch is made to promote flowering, switch to a high pressure sodium light. They are blue biased in their spectrum and imitate summer light effectively, which is the natural vegetation period of cannabis. Metal halide lamps are ideal for the vegetation phase of cannabis. Refrain from using the purple/red-tinted fluorescents, which are better for flowering. Fluorescent lights should be white or blue spectrum for infant plants. Light that is in the blue spectrum during vegetation promotes female development. Root development occurs predominantly at night, and necessary oxygen exchange occurs more efficiently at this time too. The other downside of 24hr light exposure during vegetation is poor root development and interrupted gas exchange in the rhizosphere. Some patience during vegetation is preferred to throwing half the crop away later on. With expensive primo seeds, it is better to allow an extra week of vegetation to get the best value.
Shorter day length does slow growth during vegetation, but the likelihood of females increases to 70–100%. To maximize the possibility, reduce the day period to 14.5 hours of light. The chance increases further when the day length is reduced to 16 hours. Young plants exposed to an 18-6 day-night photoperiod increases the chance of females. The plants may grow larger sooner, but this increases the risks of males developing. In the rush to get buds in the jar sooner, it is always tempting to expose plants to 24hrs of light during the vegetation cycle. Spikes up or down in nutrient mixes can cause stress, increasing the chance of males. Be sure the nutrient mixes are exact every watering. Be sure there is no light pollution interrupting plants during the night cycle. Make sure the photoperiod begins and finishes at the same time every day. Maintain stable temperatures and humidity. This is true of all the essential requirements for plant growth. Stress is the enemy when trying to get females From the moment the seeds are germinated, a growing environment with as few fluctuations as possible is ideal. Stability of the growing environment is essential to increase the female to male ratio. The key words here are a “stable growing environment.” Stress tends to produce more males, and undue stress during flowering can turn plants intersex. There are techniques and tricks of the trade that can be used for increasing the likelihood of getting more females from regular seeds. Males do have some differing growth characteristics, but it is not always easy to recognize boys from girls in the vegetation phase. It is impossible to tell if seeds are female or male, and very difficult to tell if a young plant is male or female prior to the plant differentiating. In fact, statistically, regular cannabis seeds will produce 75% or more males per crop. However, unless you purchase feminized seeds from a reputable source, females aren’t always guaranteed. Unless you are planning on doing some breeding of your own and you’re looking for a perfect male, female cannabis plants are what growing marijuana is all about. Make the most of your time, space, and precious dollars by boosting the number of females every grow. Using these techniques can increase the number of female plants grown from regular seeds. Statistically, cannabis produces more male plants than females.
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