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Does Hemp Growing/Cultivation Affect Marijuana Growing/Cultivation Via Cross Pollination?


federal farm bill hemp amendment researchA lot of marijuana growers fear hemp cultivation because they fear that cross pollination via nearby help cultivation will affect a marijuana grower’s crop. But is  that true? A recent article by Capitol Press suggests otherwise:

Marijuana growers fear hemp pollen because they want to avoid the formation of seeds in their crop, which decreases the quality and volume of psychoactive flowers.

As part of his experiment, Norton grew numerous hemp plants in a greenhouse that also contained several marijuana plants. In Oregon, recreational use of the psychoactive crop became legal this year and its medical cultivation has been legal since the late 1990s.

Despite their close proximity to male hemp plants, Norton’s female marijuana plants developed a minimal number of seeds.

“We’ve been successful with them not cross-pollinating,” said Norton.

The dearth of seeds found in the marijuana makes him optimistic that hemp and marijuana growers will find a way to coexist in Oregon, similarly to specialty seed producers who use a mapping system to avoid cross-pollination.

This experiment is one of many that is needed. As far as which marijuana strains will grow better alongside hemp than others is yet to be determined. However, this experiment definitely throws a monkey wrench into the long standing belief that hemp cultivation next to marijuana cultivation is a recipe for disaster.


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Johnny Green


  1. Going to grow hemp, to hopefully destroy all mariJuana farms near by. These places are federally illegal and bring in crime and the smell is atrocious.

  2. Me and two friends that grow have had our plants pollinated. There is a large hemp grow 10 miles or so north and this time of year the wind is out of the north. Pissed off to say the least

  3. Oregon hemp farms are already already pollinating the Willamette valley medical grows. These hemp farmers need to move their destructive crops out to the barren lands of eastern oregon.

  4. Hemp will pollinate any marijuana female plant. I have been growing since 1977 and 4 years ago I grew 5 Skunk#1 plants. 4 females and one male. I removed the male right after it formed pollen pods. I kept the pollen in a jar and left the females alone. No seeds for a month and then the wild hemp which grows within 5 miles pollinated the females. There are thousands of hemp plants. I grew 5 more females from those seeds and used the old Skunk#1 pollen to pollinate the females. The results this year are interesting. The plants started out looking like an indica but changed to a thin bladed sativa. The buds should be 75% indica genetically according to Mendel and his pea experiments. I will pollinate again with the original skunk pollen and should produce 87.5% indica seeds. This is, obviously, outdoor guerilla farming. The key is to pollinate with the indica before the wild hemp pollen hits them. The buds are big and fat with big seeds and has a slight skunk smell.

  5. David Bennett on

    this article is very misleading. any hemp within a couple of miles will pollinate your plants. it doesn’t affect potency but ruins the bud quality due to being seedy. impossible to grow seedless buds if hemp is anywhere within miles.

  6. Well hemp seed oil is the product created from hemp seed, but if you are talking medical cannabis flowers that information is false. Pollinated, seed producing cannabis strains spend all their energy creating seeds, less energy for anything else, like resin production. It also decimates the total useable plant weight. I suspect if that was true we would all be smoking -seedy pot. Just like back in the 70-80’s

  7. purplediamond on

    A breeder I met told me the plants that have seeds produce more oil then one that don’t have seeds. He said he had experimented a number of times over the years. We always have clones & no room to experiment with seeds since we are indoor only in NV.

  8. Al Schwartz on

    I grow in an illegal state where cross pollination between hemp and medical can occur up to six miles….this is how far the wind carries the unwanted pollen from hemp, if cross pollination did not occur in a test, it was sheer luck.

  9. I have had plants hermie out in a room only to affect the plant beside them, not the whole room. I have had an actual male plant pollinate (by mistake of course) and completely breed with EVERY bud in the room as if real male pollen was very light and drifted everywhere but the hermie pollen seems heavier and just drops to the floor.

    The “heavy” pollen from the hemp prevented the other plants in the greenhouse(story above) from being pollinated. Had it been a non-hemp strain his whole greenhouse would have seeded.

    I don’t know what else to call hermie pollen other than ‘heavy’, if someone else knows the size and weight difference please post your findings.

    Landrace hemp strains all hermie out to guarantee pollination, they are hermaphrodites by nature and when cultivated they are literally inches from the next plant allowing the pollen success without having to drift 50 feet

  10. Mi-Cree-Ni Quash-Mah on

    I grow pot you should grow pot they should grow pot …. yep enough said get busy .

  11. Well first there is no difference, hemp is a cannabis sativa variant/strain, ie they are not different plants, just different strains, the fundamental issue here is seed production and you NEVER want seed production in medical cannabis (caveat being for breeding), while with hemp, the seed is a primary commodity of hemp production and very desirable. The two should never be grown in proximity and the fact this experiment showed little change only suggests luck.

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