A native to south-eastern North America, the bottle-brush buckeye (Aesculus parviflora) is hard to beat for summer flowering. The Phactors have several growing as part of a semi-shady border, and they are a great plant. The specimen shown is from our university campus where several shrubs (possibly a clone) hides a dirt bank. Even in closeup the flowering is quite lovely and attracts a big diversity of insects, including, unfortunately Japanese beetles, who last year really devastated the flowers. The big display this year has not been so affected. TPP gives this plant a big thumb's up. Although native to the SE rock-bottom zone 5 temperatures did not damage ours at all.