Sirius J via High Times:
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Trichomes, those little tiny crystal-like hairs that cover the buds, hold all the good stuff. The different methods of hashmaking focus on isolating these sticky little parts of the cannabis plant because they house the majority of its resin.
Every part of the cannabis plant has at least a little THC in it. Leaves have around 4%, while buds have up to 25% or 30% of dry weight. The trichomes cover all parts of the buds, from the interior stems to the surrounding leaves.
Scientists used to think that THC and other cannabinoids were made in the green plant tissue and transported out to the trichomes during flowering, but after intensive research, they realized that the trichomes themselves make the cannabinoids and terpenes.