A small town near my hometown celebrates the Persimmon Festival every year (complete with Persimmon pudding contests and the Persimmon Queen). Persimmons are tree fruit. We have a Blueberry festival at a town in Northern Indiana. My hometown has the Limestone Festival (although I'm not quite sure that's what you're talking about -- Limestone is one of the largest natural resources in the area but they're celebrating the mining of it which isn't necessarily celebrating the environment?) Brown County has a "Spring Blossoms Art Festival" every spring -- but its a very touristy place and they have at least one festival a month :-)