I don't know what I expected my wisteria to produce in the way of seed, but this wasn't it. As if the fact it finally bloomed wasn't surprise enough, now I find this. It is covered in the softest velvety green I've ever seen. About 3-4 inches in length, it seems as though there is likely only one seed or "bean" in the fat end, but then maybe it is a cluster of many seeds. This is the only one I've noticed so far, but I hope there are more. I have no plans to try to start more wisteria - I just like the way they look!