Amethyst Falls Wisteria. Bill Head of Head-Lee Nursery discovered this selection of our Southeast native in the wild in Oconee Co., SC, while hiking. One of the unique characteristics of this cultivar is that it will flower from its first year and thereafter; whereas, with many Asian selections, they may take 20 years or more to begin flowering. This native species leafs out and then flowers on top of its foliage in late April here, making it a later bloomer than the Asiatic species, thus it is almost immune to late frost damage. Another great attribute of this variety is that it will repeat its flowering several times during the summer, usually June and August for us. This plant is vigorous, but not as invasive as the Asiatic species. This is a wonderful subject to grow on trellises and arbors in sun to part shade.