50k a year seems to be the going rate for a horticulturist with a bachelor's degree. The state average seems somewhat lower, although I don't think the information is very reliable. The Denver Botanic Gardens pays senior horticulturalists about 45k. (Again, unreliable info.) I would think that MMCs would pay less, but might also be willing to accept candidates with no formal education, so long as they have a proven history of growing good dope. I have no idea what you deserve, but if I were you I would ask for $15 an hour at least.