I've never done this either. I'm interested in anything edible, medicinal, herbal, livestock feed, trees. Basically, if it grows, I'll find a purpose for it...Lol. I'm not sure if I have enough in variety or amount to contribute. I have some purple coneflower (Echinacea), Sycamore tree, French marigolds, eastern redbud, I also have a bunch of viable veggie and herb seeds from Seeds of Change (organic). Am I worth a swap? Lol