"Breeders and producers of sweet corn go to great lengths to isolate their crops from the pollen of field corn. The same applies to hemp and marijuana. People who grow strains of Cannabis for smoking try to avoid pollination of the flowers. The superior quality material is obtained from seedless plants, the so-called “sinsemilla.”
"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."
West, David P., PhD Hemp and Marijuana: Myths & Realities. North American Industrial Hemp Council, 1998.