Cannabis plants illicitly grown in Jutland (Denmark).

Four hundred forty-nine fresh cannabis plants and 26 fruiting tops harvested in Jutland (Denmark) from July to September 1988 were characterized according to weight, height, marihuana yield, and cannabinoid content. The median weights were 308 g and 584 g for plants grown outdoors (n = 418) and in greenhouses (n = 31), respectively. The average marihuana yield was 8.7% for the plants grown outdoors and slightly lower for the greenhouse plants. Great variations, however, were seen both between and within the individual harvests. The mean concentration of total THC (tetrahydrocannabinol) was 0.87% for the plants grown outdoors. An increase according to the month of harvest was observed. For plants grown in greenhouses the mean value of total THC was 1.35%, while the mean concentration of fruiting tops was 2.13%. All plants contained cannabidiol (CBD), but only negligible concentrations of other cannabinoids. In approximately 80% of the plants the THC content was higher than the CBD content (drug type), while the rest either contained equal concentrations (intermediate type) or most CBD (fiber type).