Pistil
Definition: A pistil is the female reproductive structure of a cannabis flower, made up of the ovary and two long, hair-like stigmas that catch pollen. Growers usually use the word for those visible hairs. Pistils start white and turn orange, red or brown as flowers mature or get pollinated, offering a rough guide to bud ripeness.
How Pistil works
The first pistils appear as single white hairs at the nodes. Within days of the flip to 12/12, clusters form at branch tips, and over the following weeks thousands of pistils cover each bud. Their only job is to catch airborne pollen. On a sinsemilla crop with no males nearby, they never succeed, so the plant keeps making more flowers and resin.
Reading pistil color
- Mostly white and straight: early or mid flower, with buds still building.
- About half darkened: buds are maturing, so start checking resin glands.
- 70 to 90% orange or brown and curled in: usually near the harvest window.
Why not to rely on pistils alone
Heat, intense light, low humidity or handling can darken pistils early. Some strains also push fresh white hairs late in flower, a sign of stress or foxtailing. Pistil color is a quick visual check, while trichome color under a loupe is the more reliable measure of ripeness.
Pollination clues
If pistils across a whole bud wither and darken within 2 to 3 days in mid flower, check for pollen. A stray male or a nanner may have released it, and seeds will form in the affected calyxes.