Potential Cross Pollenation of Drug-Crop Cannabis With Industrial Hemp During Cultivation

"Hemp fields, in fact, could be a deterrent to marijuana growers. A strong case can be made that the best way to reduce the THC level of marijuana grown outdoors would be to grow industrial hemp near it. An experiment in Russia found that hemp pollen could travel 12 kilometers. This would mean that a hemp field would create a zone with a 12-kilometer radius within which no marijuana grower would want to establish a crop.
"The reciprocal also applies. Growers of hemp seed would not want Cannabis of an 'off type' (i.e., not the intended genetic type) mixing its pollen with their flowers. The isolation of genotypes is a common procedure used by the seed industry to preserve the genetic integrity of varieties. Valued strains are created by plant breeding, at substantial expense. Marijuana pollen would destroy this value."

Source: 

West, David P., PhD, "Hemp and Marijuana: Myths & Realities," North American Industrial Hemp Council, 1998. Last accessed February 18, 2015.
http://www.naihc.org/hemp_info...

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