Breaking Down the Bud: Zoom In on Trichomes
These fine outgrowths on the cannabis plant serve many purposes, including housing resin glands full of THC.
Some misinformed people judge harvest time simply by the color of a plant’s stigmas, and while that is a good pre-harvest indicator, we prefer using a 20x or 100x magnification loupe to look directly at the trichomes.
There are four distinct types of plant hairs, better known as trichomes. There is a half-bubble, larger, egg-shaped resin gland that clings to the surface of the leaves and bud and contains only smell and taste terpenes (no THC): this is called a bulbous trichome. It is basically a plant hair without a stalk.
There is also a crystolith trichome, which basically looks like a hair with a long, pointed tip. These trichomes appear primarily on the underside of leaves and their main purpose is to protect the plant from insects and spider mites. They are protective trichomes that discourage insects and mites from eating foliage. They also contain no THC.
The third trichome is called a sessile stalked capitate trichome. It is several times larger than the bulbous glandual trichome, but is still very small. It begins to develop in the plant’s vegetative stage and stays very close to the plant’s surface. It contains very low levels of terpenes and THC and is considered a contaminant to hash makers.
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