These are
hair-like outgrowths that cover the surface of a cannabis plant,
flowers, leaves, etc. They have many functions related to protecting the plant and regulating its temperature. Trichomes are resinous in nature, and it is inside them that
vitamins,
cannabinoids (CBD), and
terpenes (e.g., limonene/lemon scent) are synthesized. It is thanks to the
trichomes that cannabis possesses most of these virtues and
enticing scents.