Twice a year I cashier at the sale here in Gainesville. (Making change out of a cash box is a dying art, but I was a retailer pre-fancy cash registers.) Let me tell you, it's a wild place full of rabid gardeners. The cars leave with plants hanging out the sides, filling windshields from the passenger seat, and tucked in on every floor surface.
Each time I get handed a pile of twenties and give back a bit of change I see the local economy meshing with the local environment. These plants won't need fertilizer or pesticides and not much water if they're planted in the right places. And the money goes to nurseries that will now cultivate even more native plants and next spring we'll have another plant sale and more dotted horsemint, firebush, viburnums, anise, woodland sunflowers, and bluecurls will replace all the imported, drug dependent plants.
Wherever you live, find out about the native plants in your area.