Sexual Determination

Sexual determination in cannabis refers to the genetic and environmental mechanisms that establish whether a plant expresses male, female, or hermaphroditic characteristics. Cannabis is typically dioecious, meaning individual plants develop either staminate (male) or pistillate (female) flowers, though environmental stress can trigger hermaphroditic expression in phenotypically female plants. Understanding sexual determination is fundamental to breeding programs, as seed production, pollination timing, and trait inheritance all depend on controlling which plants flower as males versus females. Breeders and cultivators distinguish between genotypic sex (chromosomal makeup) and phenotypic sex expression (observable characteristics), since identical genetics may display different sexual forms under varying light, temperature, or nutrient conditions. Regular seeds carry unselected sex chromo

Breeders manipulate sexual determination to create feminized seed lines, eliminate males from breeding populations, or maintain stable male parents for controlled crosses. Understanding sex expression stability across environments helps breeders select for plants that reliably flower as females or reliably produce viable pollen, reducing unpredictable hermaphroditism in commercial and research con