It’s not worth the legal risk to sell plants with controlled substances (Khat, Iboga, ect) and the cost to lobby in an attempt to have such things legalized would be very very expensive to fund.
Salvia and Kratom has been openly sold for a long time but the industry is dominated. A few states have specifically regulated Kratom under the Kratom Consumer Protection Act and have affordable licenses available like Arizona, Nevada, Utah, Georgia but I think Utah’s is the easiest and most setup program right now but not alot of people in those states are following the Kratom regulations. Salvia has age restrictions in some states but Kratom is more explicitly legal in the states with the KCPA bill passed. Plants like Blue Lotus, Kava, Kanna and others can be sold as a supplement and in Kava bars and Tea Rooms but In terms of plants in general that have active things? I’d be writing a book long post listing them all.