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I don't even remember how I know this. I probably read it in a book and then tried it. I've known these trees since I've been little, so the identification is easy. That's a good way to start eating wild plants -- start by making a list of the plants that you can identify, rock solid, no question. And then find out if any of them are edible. These black locust flowers are some of the best! :D

I don't know were I could find them, There aren't many places around here :)