Industrial hemp growers are still working through some kinks to comply with state rules and have a successful growing season. One requirement of growers is that the level of tetrahydrocannabinol (THC) in hemp plants be kept below .3 percent. According to some growers, certain hemp seed is proving to be more THC potent than expected and soil conditions in the Midwest only amplify that. Many are seeing higher THC levels because of the kinds of seeds available on the market when the program launched, many of which were designed for different conditions than land in Illinois. (WGLT)