|Posted by jathton (Oklahoma City, OK) on Oct 17, 2019 6:10 PM
In the 45 years I've been involved with garden design and landscaping I've seen exactly two white flowering Japanese Wisterias in Oklahoma City. This is primarily because Japanese Wisteria has not been available here for very many years. It is also due to the fact that white flowering Wisteria has not been marketed very well. So the gardeners here cannot be expected to get excited about a plant that cannot be found or that they haven't heard about or seen in the media.
That is a shame because on the two criteria by which Wisteria is judged,,,  the beauty of the flowering racemes and  the fragrance of the blossoms... a clear case can be made in favor of the white flowering Japanese varieties.
Donald Wyman, the head of the Arnold Arboretum from 1935-1970, made the case for Japanese Wisteria in 'Shrubs and Vines for American Gardens'................................................
If you love Wisteria for the beauty of its flowering racemes you might like to know that Chinese Wisteria... the one everyone buys... has racemes that are usually 6-12 inches in length. Japanese Wisteria, on the other hand, has flowering racemes that measure 8-48 inches.
If you love Wisteria for its fragrance when in bloom you might like to know that Chinese Wisteria is considered to be slightly fragrant. But Wyman makes it clear that varieties of Wisteria noted for their "delicious fragrance" belong mostly to the species floribunda [Japanese Wisteria].
Having said all that, I want to point out that 'Issai Perfect' has long been considered to be the Japanese Wisteria with some of the longest, most fragrant flowering racemes of all Japanese varieties.
And having grown this variety I will simply say you are not prepared for the degree to which this Wisteria will knock your socks clean off!
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