Hash, or hashish, is extracted from cannabis plants. It is derived from collecting resin stalks, trichomes, or THC, from cannabis plants. This classic form is commonly collected by growers when they handle mature plants. The resinous trichomes of the plant rub off on their hands, thus creating the common terminology for it: rub. Hash is the primary form of cannabis used in many European countries. Since it is produced from resin, it has a higher thc % than flower. Hash has approximately 40% of thc whereas most flowers range from 15-25%.