Sex is determined early in the seedling stage when the cotyledon leaves form. Light, temperature, nutrients all play a roll in determining sex. There are products available on the market that affects the RNA of the seed and increase the chance of female plants.

In 48 hours before you harvest will have very little affect on the final outcome of the plant. By then either there or itâ??s not. If you are looking for higher THC% itâ??s more dark then stress. Dark is not stress the same way heat is.

Moving from cold to hot will stress the plant and may have an adverse affect like hermie.