Resin is the sticky insoluble organic compound that is secreted by plants; moreover, in cannabis the resin contains the cannabinoids and terpenes. During the growth cycle, cannabis resin serves as a defense mechanism for the plant which it naturally developed to protect it from predators and pests. Resin glands are the beautiful stalked round crystals of THC and other cannabinoids, that glisten on your buds during it’s bloom phase. Trichomes are the source of resin and cannabinoids in your cannabis plant. They are small spheres of cannabis resin which give it a frosty white appearance.