Unlike most commercially developed strains, indica landraces exhibit plants with varying THC/CBD ratios. The subjective effects of sativas and indicas are said to differ, but the ratio of tetrahydrocannabinol (THC) to cannabidiol (CBD) in most named drug varieties of both types is similar (averaging about 200:1). Sativas bloom later than indicas, often taking a month or two longer to mature. They are often favored by indoor growers for their size. Pure indica varieties are shorter and bushier, with wider leaflets. Pure sativas are relatively tall (reaching as high as 4.5 meters), with long internodes and branches, and large, narrow-bladed leaves. However, because Cannabis ruderalis flowers independently of the photoperiod and according to age, it has been used to breed autoflowering strains. A third species, Cannabis ruderalis, is very short and produces only trace amounts of tetrahydrocannabinol (THC), and thus is not commonly grown for industrial, recreational or medicinal use. The two species of the Cannabis genus that are most commonly grown are Cannabis indica and Cannabis sativa.
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