Pistillate Flowers

Pistillate flowers are the female reproductive structures in cannabis, characterized by the presence of a pistil (stigma, style, and ovary) without functional stamens. In dioecious cannabis plants, pistillate flowers develop exclusively on genetically female plants and are the sites where seeds develop after pollination. Breeders and cultivators identify pistillate flowers by their distinctive two-pronged stigmas, which emerge from the flower calyx and are commonly white, pink, or reddish in color. Understanding pistil morphology—including stigma color, density, and branching patterns—is important for strain identification and seed production work. Pistillate flower development is environmentally influenced by photoperiod and light quality, making it a key focus in controlled breeding programs.

Breeders select for pistillate flower characteristics to improve seed set in controlled crosses, enhance visual phenotype markers for early sex identification, and develop stable female-only breeding lines. Stigma color and structure are often used as secondary phenotypic markers when establishing true-breeding cultivars.