Cross-pollination could cost marijuana farmers several thousand dollars as hemp production expands nationwide

Cheshire Creek, an outdoor marijuana cultivation operation in Washington state, suffered financial damages due to cross-pollination of its plants inside the fence from a nearby hemp farm. (Photo courtesy of Cheshire Creek)

(A version of this story appears at Hemp Industry Daily.)

Outdoor marijuana growers are reporting an increase in cross-pollination from hemp farms, a development that could mean MJ cultivators might lose upwards of tens of thousands of dollars if their plants become unmarketable as flower products.

As the marijuana and hemp industries increasingly share the same cultivation territory, the number of conflicts is likely to increase, particularly in areas with thriving outdoor cannabis cultivation.

Washington state is a case in point. In April, Gov. Jay Inslee signed Senate Bill 5276 into law, opening the state up to hemp production in response to the 2018 Farm Bill in part by removing the previous 4-mile buffer between outdoor marijuana grows and hemp farms.

At least one marijuana farmer has experienced firsthand the consequences of this change in the law.

“We took a big hit,” said Robert Morf, who owns and operates Cheshire Creek, an outdoor marijuana cultivation operation in Waterville, Washington.

He estimated he will lose about $40,000 this year after his midsized, 600-plant farm was cross-pollinated by pollen from the male plants he said came from a neighboring hemp grower.

All to extract

According to Morf, his flower is full of seeds, reducing the usable volume and overall quality and value of the crop.

He won’t be able to sell it on the wholesale or retail flower market and will take a financial hit by selling it all for extraction.

Morf has grown marijuana for three years “out in the middle of nowhere” with no other cannabis cultivators for 30 miles.

He didn’t have any trouble with his neighbors until the buffer was removed under the new hemp law.

The hemp grower who leased the land from the farmers across the road assured Morf the plants would be grown from clones.

Since Morf was there first with his marijuana operation, it was up to him to give the OK, and he took it on faith the hemp growers would remove the male plants.

He thought “cross-pollination would have been worse for them than it would have been for me.”

Morf contacted his local and state political representatives as well as his contact at the Washington State Liquor and Cannabis Board (LCB), but he found no recourse.

To prove it wasn’t his own plants that pollinated his field, Morf pointed out that the LCB’s tracking system will show that he planted from female clones.

“We’ve gone through three years of growing, and the most I’ve seen is a female plant with one bud herming off a stem last year,” he added.

“Herming” refers to a cannabis plant developing both male and female flowers.

Morf has considered suing, but he figures it’s not worth the cost.

“At this point, it’s ‘screw it’ and move on,” he added.

The hemp growers have left the plants cut down in the field and won’t be returning next year to farm that land, Morf told Marijuana Business Daily.

Carefully source your seed

A similar problem is shaping up in the bordering state to the south, Oregon.

Pete Gendron, a grower in Sunny Valley and president of the Oregon SunGrowers Guild, estimated the cross-pollination issue is impacting about 8% of the state’s marijuana production.

In terms of total acreage affected by cross-pollination, it’s an increase from last year, he added.

That’s largely because the number of hemp acres has increased by about 500%.

According to Hemp Industry Daily, Oregon had 11,754 acres in 2018 and increased to 51,313 acres in 2019.

His advice to growers looking to avoid male plants showing up in their fields: Buy your seed from a reputable provider and try to make sure your hemp-growing neighbors are using feminized seeds.

Tell them, “if you pollinate me, you’re going to be pollinating yourself, too,” Gendron said.

“That being said, it won’t save you from field walking,” he added, meaning growers still need to check to ensure their plants haven’t hermed or that no male plants have grown from seed.

“It really only takes one (male plant) to ruin your day,” he said.

Colorado concerns

In Pueblo, Colorado, the area of the state with the largest amount of outdoor-grown marijuana, the county regulators have been working to allow both hemp and cannabis cultivators to coexist.

Steven Turetsky, managing director of Pueblo-based hemp grower Shi Farms, said hemp farmers have been asked to put their “best effort forward to not grow male plants.”

That’s in part because outdoor-grown marijuana has been a shot in the arm to the local economy.

The general sentiment is that hemp growers should all use clones to ensure the plants are females.

“Obviously, with cannabis, even if you plant from clones, there can be mutation,” Turetsky said. “But it significantly decreases the risk.”

He said he came to the realization that it’s beneficial for his company to act in good faith toward marijuana growers.

By also only using clones, his company has avoided dealing with vendors who might be selling nonfeminized seeds.

“We don’t want seeds, either,” he said.

According to Wendy Mosher, president and chief executive officer of Fort Collins, Colorado-based seed company New West Genetics, a grower will lose about 1% of total cannabinoid content if a field is cross-pollinated.

While Colorado is considered generally favorable to hemp compared to other states with marijuana programs, cross-pollination also is happening to hemp-based CBD farms in Colorado, she added.

When a hemp farm is cross-pollinated, the farmer can thresh the crop to try to salvage some of it.

Mosher said one male in a field a mile away can pollinate a crop, and it can be very difficult to determine the source.

“It’s just impossible to tell where it’s coming from,” she added.

USDA trying to help

The U.S. Department of Agriculture (USDA) acknowledges the cross-pollination issue and has set aside money to address it.

In October, the agency awarded $500,000 to a Virginia Tech research team to get better data on pollen drift.

The goal is to predict how and where pollen grains travel.

Researchers will use drones to track pollen, hoping results can inform regulations on how far growers should keep hemp and marijuana apart to prevent damaging cross-pollination.

“Having a validated and reliable long-distance transport prediction model for wind-dispersed pollen is critical to establishing appropriate isolation distances,” plant sciences professor David Schmale said in a Virginia Tech statement announcing the grant.

Bart Schaneman can be reached at [email protected]

6 comments on “Cross-pollination could cost marijuana farmers several thousand dollars as hemp production expands nationwide
  1. Crystal Fricker on

    Bart,
    Thank you for this report. I am chair of the Hemp advisory committing working on certification issues with Oregon State University. If you have any other info on pollen flow we would be interested in the progress or contact info to follow up as well.
    Crystal Fricker

    Reply
  2. Mark Atkins on

    I grow hemp from feminized seed but realize that feminized doesn’t mean no males. With feminized seeds I can expect one male for every 3000 to 5000 plants. I started monitoring at the beginning of August to assure that all males are found before pollination. I also grow marijuana and don’t want my plants cross pollinated. The reputable seed producers provide this information.

    Reply
  3. cbd flowers uk on

    Fantastic insightful article on cross-pollination. A subject that will become to the forefront as more and more countries are waking up to growing hemp. I wonder if the seeds from that harvest would be usable or their origins as a cross-pollinated seed not usable for the next year’s crop?

    Well structured article and insightful, thank you!

    Reply
  4. Lawrence Goodwin on

    A belated thanks for this article, Mr. Schaneman!

    Many moons have passed since I first posted comments here that warned specifically about pollination from male flowers. People have to see this is a perfectly natural and good thing.

    Cannabis plants, in scientific terms, are dioecious—they develop male and female flowers on separate plants. Real “hemp” crops are exactly that: pollinating male and seed-bearing female flowers grown together in fields by hard-working farmers, either for seed or stalk production—regardless of the 2018 “Farm Bill” and its arbitrary “0.3 percent THC” definition.

    How many times do I need to emphasize this point? We can’t trust ANY law related to cannabis plants that is passed by our corrupted U.S. Congress, considering its despicable repression of “marihuana” commerce over the last 82 years.

    You want seedless female flowers for optimum CBD, THC and other “cannabinoid” yields? Grow your female flowers in thoroughly protected indoor spaces, such as air-tight greenhouses. It’s the only way forward. Cannabis plants are sufficiently productive in a combination of natural & artificial light.

    Reply

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