Isn't there lots of... crossover knowledge between hemp and the psychoactive cultivars?
He was wanting to know about strains and what bugs eat it and fertilizers to use and was especially worried about growing plants that had levels of THC that were too high, even by just a tiny amount. He didn't want get busted for that.
It's been a few generations gone by since it was legal to grow hemp as a crop. They'll have to relearn it and that will take some time.