Spring and fall are ideal times to plant although as long as the conditions aren't extreme you can plant your wisteria throughout the year.. Since it blooms a bit later than some other Wisteria … The Amethyst Falls Wisteria is a North American native, and it is amazingly easy to grow. It is clearly more red-purple than 'Blue Moon' … When planting your Amethyst Falls Wisteria be sure you have the right location and conditions for your new plant to thrive. 'Amethyst Falls' flowers sooner than the Asian types (some of which can take 10 years or more), blooming its first season with fragrant, vividly blue flowers on 4- to 6-inch racemes that… 'Amethyst Falls,' like other Wisteria… This fine American Wisteria offers multitudes of corpulent dangling racemes in fetching violet purple. Plant it in well-drained soil, give it a bit of water, and watch it thrive. The Amethyst Falls Wisteria … All of these things make it an ecologically sensitive choice. Wisteria frutescens 'Amethyst Falls' - 3 available.