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Industrial hemp plants, growing for CBD

Researchers at the John C. Pair Horticultural Center near Wichita are growing industrial hemp to determine best practices for Kansas producers. | Download this photo.

K-State researchers make progress on work with industrial hemp

In first year, they’ve found that plants produce more CBD when grown indoors

December 12, 2019

HAYSVILLE, Kan. – After one year of growing industrial hemp in test plots, Kansas State University researchers say they’ve moved closer to providing guidance to producers interested in growing the alternative crop in Kansas.

In April 2018, Kansas Gov. Jeff Colyer signed a bill enacting the Alternative Crop Research Act, leading to the legal production of industrial hemp in the state. Kansas is one of 42 states approved to grow the crop; the Kansas Department of Agriculture reported that there were 207 Kansas growers in 2019.

None of those growers, however, had information available to show best practices for growing industrial hemp in Kansas soils.

Listen to Eric Atkinson's interview with Jason Griffin on Agriculture Today

“It’s a brand new crop that nobody in Kansas should have legal experience growing,” said Jason Griffin, director of the John C. Pair Horticultural Center, one of three sites where K-State’s research trials have taken place this year (research was also conducted at K-State facilities in Colby and Olathe). “Since it was new, we needed baseline information on how to grow the crop successfully.”

Griffin noted that “99% of the people growing industrial hemp in Kansas this year were growing for cannabidiol,” better known as CBD. Cannabinoids have high interest among consumers because of their purported medical and therapeutic benefits in humans and companion animals.

CBD and other varieties are legal to grow if they produce less than .3% tetrahydrocannabinol, or THC. If the plant’s THC level is greater than .3%, it is considered marijuana and not legal to grow or possess in Kansas.

“We knew that Kansas farmers wanted to get into this industry,” Griffin said, “and our job is to conduct research to help farmers be successful with the crop.”

Griffin and the research team at the John C. Pair center planted seven CBD varieties, including five in high tunnels, which are plastic-covered structures that provide some protection from the environment compared to open field conditions.

“It’s well-known that high tunnels in the specialty crops arena have certain advantages over crops grown outside,” Griffin said. “For our purposes, it reduced solar radiance, reduced wind and reduced pest presence. But, specifically for hemp, we had our high tunnel completely enclosed in insect screens, which is a really fine netting. We wanted to see if the insect screen would reduce the amount of pollination inside the tunnel. And it appeared it did.”

Griffin said that in the hemp industry, pollination “is a big deal. CBD is produced in the female flower buds, and if those female flower buds get pollinated, your concentration of CBD just tanks into the basement. You get almost none. So you have to keep pollen away from those female flower buds.”

That caused problems for the hemp varieties that K-State grew outside, Griffin said, noting that pollen can travel as far as three miles. “I think it would be very difficult to have a large-scale, outdoor CBD production system successfully without somehow protecting those plants from pollen.”

Because they were protected from insects and other pollinators, “the plants inside the high tunnel were just superior,” Griffin said. “In that protected environment, they were larger and had more flower buds. Because they had more buds, they had a higher CBD content.”

K-State’s work also looked at various production systems, including growing the plants with organic and conventional fertilizer. Researchers also looked at the potential of growing industrial hemp for fiber and grain.

The university’s work will continue in 2020, Griffin said. “This was our first year,” he said. “We probably made some mistakes and we’ll probably improve as any grower might as they get more experience with a crop.”

Griffin said updated information on K-State’s research with industrial hemp is available on Facebook. More information about the John C. Pair Horticulture Center also is available online.

At a glance

K-State researchers have found that industrial hemp produces more cannabidiol, or CBD, when grown indoors.   


K-State industrial hemp research (Facebook)

Notable quote

“The plants inside the high tunnel were just superior. In that protected environment, they were larger and had more flower buds. Because they had more buds, they had a higher CBD content.”

-- Jason Griffin, director, John C. Pair Horticultural Center


Jason Griffin

Written by

Pat Melgares

For more information

Industrial Hemp in Kansas - Part 1 - So you want to grow hemp


Industrial Hemp in Kansas - Part 2 - What about seed?


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K‑State Research and Extension is a short name for the Kansas State University Agricultural Experiment Station and Cooperative Extension Service, a program designed to generate and distribute useful knowledge for the wellbeing of Kansans.
Supported by county, state, federal and private funds, the program has county extension offices, experiment fields, area extension offices and regional research centers statewide. Its headquarters is on the K‑State campus in Manhattan.