@DankDaddy, Cannabis responds to the amount of light there is during a 24hr period. To start vegetative growth you need at least 14 hours of day light. To start flowering you need 12 hours of daylight. So at the end of July and beginning of August the outdoor plants begin to flower. Some strains vary in how much light it takes to start flowering. Also your latitude and growing season affects flowering. I choose genetics from grower based on what month a plants life cycle is finished.