As part of a marijuana plant’s reproductive system, the stigmas are the white hair-like strands that grow on the plant’s pistils. Stigmas are an essential part of the anatomy of a cannabis plant, as these hairs collect the pollen from the male plants and are responsible for creating cannabis plant seeds. After the weed plant is mature, the color of the stigmas can change from white to hues of yellow, orange, red, and, finally, brown. An important note to highlight is that stigmas don’t influence the potency or taste of weed.