Kentucky wisteria is considered var. macrostachya of this species.
Not recommended for Sunset zone 37 (stops at 34), but considering that var. macrostachya is said to be cold hardy all the way to USDA zone 3, I don't worry too much about this.
Twining (needs support). Do not use a tree as support, as the wisteria will crush it under its eventual weight. Still not as rampant as the invasive foreign wisterias (W. sinensis, W. floribunda) though. Also doesn't usually take forever to begin flowering like they do, and when they do bloom, it's well past any late spring frosts. Unfortunately, Druse compares the fragrance unfavorably to that of the Asian invaders; I haven't yet gotten close enough to a flowering specimen to weigh in personally.
Difficult to transplant.
Seeds poisonous.
'Amethyst Falls' has earned the PHS Gold Medal Award. Var. macrostachya 'Blue Moon' may bloom up to thrice in a single growing season.
Sources: Sunset, Missouri BG, Dirr, NCSU, USDA, Druse.
Buy 'Amethyst Falls' at PlantingTree.com (affiliate link; supports this website)
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