This article presents common techniques and facts regarding the cultivation of the flowering plant cannabis, primarily for the production and consumption of marijuana buds. Cultivation techniques for other purposes (such as hemp production) differ. A basic description of hemp cultivation can be found in the US film Hemp for Victory.
Cannabis belongs to the genus Cannabis in the family Cannabaceae and includes three species, C. sativa, C. indica, and C. ruderalis (APG II system). It is typically a dioecious (each individual is either male or female) annual plant (life period: April–September).
C. sativa and C. indica generally grow tall (some varieties reach 4 m) and their females start the production of flowers rich in THC (1% to 29%) as the season changes from summer to autumn. C. ruderalis is very short, produces only trace amounts of THC and flowers independently of the photoperiod and according to age. However, commercial cross-bred hybrids containing both ruderalis, indica and/or sativa genes exist (usually called autoflowering), the "low rider" being the most famous.