Not completely seedless, but close to it -- still a good thing, because the only big knock I can think of on the tree-form horsechestnuts is their fruits.
Judged by Dirr to be superior to A. pavia (and also to A. hippocastanum, its other parent, a non-native which was once named "Weed of the Week" by the USDA Forest Service and therefore is deliberately omitted from this database) for landscape use.
Intolerant of hot, humid climates... but also gets leaf scorch in hot, dry ones. Even so, Sunset recommends it as far south as zone 32.
Taprooted and therefore difficult to transplant. Fruits (if any) are poisonous. Malodorous bark(?!). Keep the trunk shaded by leaving lower branches on, to keep the bark from cracking. Poor compartmentalizer of decay.
Flowers of this cultivar are darker red and larger than in the straight hybrid. Plus, you know, the whole "seedless" thing.
Sources: Sunset, Stoecklein, Missouri BG, UFL, AHS, Cal Poly.
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