Grow American Wisteria (Wisteria frutescens) to fill your garden with gorgeous Hardy to zone 5, ' Amethyst Falls ' blooms its first year—unlike its Asian cousins. Welcome to the famous Dave's Garden website. Join our friendly community that shares tips and ideas for gardens, along with seeds and plants. Perfect for smaller spaces, this gorgeous twining vine grows at about a third the rate of Asian wisteria. Blooms at an early age, with its lightly fragrant purple.