Wisteria macrostachya 'Clara Mack' - This a pure white flowering form of American Wisteria. 'Clara Mack' is June blooming. Dark green foliage is handsome and even the flower buds are striking and architectural. Wisterias are always splendid on a pergola or any strong support from which the dangling flowers and its lovely scent can be appreciated. Site in full sun planted in fertile draining soil to which a handful of lime has been added. Cutting grown.