I don't know about other areas of the country, but here in Va these onions grow wild all over the place. Everyone has a few bunches in their yards all summer. I pulled up a few bunches and separated out the largest onions and planted them in the garden. The greens are short on the bunch in the pics because they broke off when I went to pull them out. There's usually about 50-100 in a bunch and they're pretty small, but tasty!
Does anyone know what kind of onions they are?