Stigma
The hair-like structures on a cannabis flower that catch pollen — often called 'pistils' or 'hairs' by growers.
When growers say 'the pistils are turning orange,' they almost always mean the stigmas. Botanically, a pistil is the whole female reproductive structure; the stigma is just the sticky tip that catches pollen. The color change from white to orange/red/brown is a rough ripeness cue, but it's not as reliable as checking trichomes under magnification. Stigmas contain almost no cannabinoids and don't get you high — they're a signal, not a product.
Definition
A stigma (plural: stigmas or stigmata) is the pollen-receptive tip of the female cannabis flower's reproductive organ. Stigmas appear as fine, hair-like filaments — usually two per flower — emerging from a small green structure called the bract [1][2]. In strict botanical terms, the pistil is the entire female structure (stigma + style + ovary), but in cannabis culture 'pistil' and 'stigma' are used interchangeably to mean the visible hairs Disputed.
What stigmas do
Stigmas are sticky and feathery so they can catch airborne pollen from male plants. Once pollinated, the flower diverts energy into producing seeds [1]. In sinsemilla (seedless) cultivation, growers prevent pollination so the plant keeps pushing resin and cannabinoids into the unfertilized bract and surrounding tissue instead [2].
What stigmas don't do
Stigmas are not a meaningful source of cannabinoids. Analyses of cannabis flower anatomy show trichomes — concentrated on bracts and sugar leaves — hold the vast majority of THC, CBD, and terpenes [3] Strong evidence. Smoking a pile of dried stigmas will not get you high.
Stigma color is also a weaker ripeness indicator than folklore suggests. The common rule of 'harvest when 70-80% of hairs have darkened' is a useful rough guide, but trichome maturity (clear → cloudy → amber) viewed under a loupe correlates more directly with cannabinoid content Weak / limited[4]. Stress, heat, and genetics can darken stigmas before the plant is actually ripe.
Used in articles
You'll see 'stigma' referenced in articles on flower anatomy, harvest timing, pollination, and sinsemilla. When a grow guide says 'wait for the pistils to turn,' they mean stigmas.
Sources
- Peer-reviewed Spitzer-Rimon, B., Duchin, S., Bernstein, N., & Kamenetsky, R. (2019). Architecture and Florogenesis in Female Cannabis sativa Plants. Frontiers in Plant Science, 10, 350.
- Book Clarke, R. C., & Merlin, M. D. (2013). Cannabis: Evolution and Ethnobotany. University of California Press.
- Peer-reviewed Livingston, S. J., Quilichini, T. D., Booth, J. K., et al. (2020). Cannabis glandular trichomes alter morphology and metabolite content during flower maturation. The Plant Journal, 101(1), 37-56.
- Peer-reviewed Aizpurua-Olaizola, O., Soydaner, U., Öztürk, E., et al. (2016). Evolution of the Cannabinoid and Terpene Content during the Growth of Cannabis sativa Plants from Different Chemotypes. Journal of Natural Products, 79(2), 324-331.
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