As the hemp industry grows, producers face the challenge of cultivating a crop that has received comparatively little scientific study, and that can become unusable – and illegal – if it develops too much of the psychoactive chemical THC.

In a new study, Cornell researchers have determined that a hemp plant’s propensity to “go hot” – become too high in THC – is determined by genetics, not as a stress response to growing conditions, contrary to popular belief.

“Often that issue of going hot has been blamed on environment,” said Larry Smart, senior author of the study and professor in the horticulture section of the School of Integrative Plant Science.

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Krisy Gashler ~ News.Cornell.edu ~