In the structure of the female cannabis plant, the pistils are the reproductive organ. The pistils are often confused with stigmas. However, the pistils are the part of the cannabis plant from which the stigmas grow. The pistil is the part where the pollen from the male plant is collected. The pistils have three parts: the stigma, ovary, and style. Over time, the appearance of the pistils and their parts can change colors as the cannabis plant grows.