My late grandmother had a lovely native wisteria vine. The natives aren't as aggressive as the Asian ones, and, unlike the Asian cultivars, bloom after leafing out. Anyway, I went to the old homeplace to try to get a bit of the old vine to propagate a new one and discovered the lot was covered with dozens of baby wisteria vines. My friend Duck keeps the place bushhogged for me. I belive that he must have caught a piece of vine with mature seed pods in the mower and scattered the seeds over a large area, resulting in plenty of new plants this year. I wanted some for bonsai, and some friends wanted one to train on a wall, so I'm happy.