Field Crop Production

When industrial hemp crops are grown for fiber or seed, both male and female plants are usually left standing in the field until harvest. Most medical Cannabis is grown for its psychoactive resin by a different technique. In the early 1970s, a handful

Thc Cbd 1970s

Fig. 1. Medical Cannabis cultivars grown in the United Kingdom by GW Pharmaceuticals, which form the basis for GW's development of prescription medicines. The larger inflorescence (A) is a cannabidiol (CBD)-rich cultivar containing only traces of A9-tetrahydrocannabinol (THC), and the smaller inflorescence (B) is a THC-rich cultivar containing only traces of CBD.

Fig. 1. Medical Cannabis cultivars grown in the United Kingdom by GW Pharmaceuticals, which form the basis for GW's development of prescription medicines. The larger inflorescence (A) is a cannabidiol (CBD)-rich cultivar containing only traces of A9-tetrahydrocannabinol (THC), and the smaller inflorescence (B) is a THC-rich cultivar containing only traces of CBD.

of North American illicit marijuana cultivators began to grow sinsemilla (Spanish for "without seed") marijuana that within a few years became the predominant style of North American and European marijuana production. The sinsemilla effect is achieved by eliminating male plants from the fields, leaving only the unfertilized and therefore seedless female plants to mature for later flower and/or resin harvest.* In lieu of setting seed in the earliest flowers, the female plants continue to produce additional flowers covered by resin glands, which increases the percentage of psychoactive and medically valuable A9-tetrahydrocannabinol (THC) or other cannabinoids in these flowers. Yields of terpenoid-rich essential oils produced in the resin glands along with the closely related terpenophenolic cannabinoids are also significantly raised in seedless flowers (7). Throughout the 1980s, the vast majority of domestically produced North American and European drug Cannabis was grown from seed in outdoor gardens, but during the 1990s the popularity of growing sinsemilla in greenhouses and indoors under artificial lights grew rapidly.

Continue reading here: Greenhouse and Grow Room Production

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