<P> There has also been a recent movement to characterize strains based on their reported subjective effects . For example, WoahStork has used machine learning algorithms to classify strains into six Distinct Activity groups . </P> <P> In addition to pure indica, sativa, and ruderalis varieties, hybrid varieties with varying ratios of these three types are common . For example, the White Widow hybrid containing about 60% indica and 40% sativa ancestry . These hybrid varieties exhibit traits from both parental types . There are also commercial crossbred hybrids which contain a mix of both ruderalis, indica and / or sativa genes, and are usually autoflowering varieties . These varieties are bred mostly for the medicinal cannabis market, since they are not very appreciated by recreational cannabis users because ruderalis varieties are lower in THC and impart a slightly unpleasant taste . "Lowryder" was an early auto - flowering hybrid that retained the flowering behavior of ruderalis plants, while also producing appreciable amounts of THC and CBD . Autoflowering cannabis varieties have the advantage of being discreet due to their small stature . They also require shorter growing periods, as well as having the additional advantage that they do not rely on a change in the photoperiod to determine when to flower . </P> <P> Breeding requires pollinating a female cannabis plant with male pollen . Although this occurs spontaneously and ubiquitously in nature, the intentional creation of new varieties typically involves selective breeding in a controlled environment . </P> <P> When cannabis is cultivated for its psychoactive or medicinal properties, male plants will often be separated from females . This prevents the fertilization of the female plants, either to facilitate sinsemilla flowering or to provide more control over which male is chosen . Pollen produced by the male is caught and stored until it is needed . </P>

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