Hashish is a potent form of cannabis produced by collecting and compressing trichomes, the most potent material from cannabis plant.

Hashish, hash for short, is derived from the “kief,” or the dried resin, of the flowering tops of mature and unpollinated female cannabis plants. The resin glands are called trichomes or crystals. Hash is harvested by collecting the powdery resin either by hand, by mechanical beating of the plants, or by submersing cannabis plants in icy water and then using small sieves to remove the trichomes, which are then dried (this type of hashish is called “bubble hash”). The remaining kief is typically pressed into “cakes,” or blocks, which are then smoked in pipes, vaporized and inhaled, or mixed with marijuana in joints.