There's no need to add to the comments made by ILPARW... they are very complete. I liked learning about its very limited native range... and I absolutely agree with his last three sentences.
Bottlebrush Buckeye is a flowering shrub I only knew from books and magazines for many years. I never saw one in a public or private garden until I visited the Missouri Botanical Garden in late spring in 2003. It came into view as I passed the Climatron and started toward the Chinese Garden. At MBG the Bottlebrush Buckeye was 12 feet high, 12 feet deep, and formed an undulating planting that probably stretches along a slope under the light shade of large trees for close to a hundred feet. It was in full bloom... it was magnificent and overwhelming all at once.
I had wanted one ever since until finally, two years ago, Mary's Garden in Hamilton, Ohio was nice enough to send me a young plant. It has lived outside ever since in a 10 inch container... and last year it produced four very nice bloom spikes. Mine looked like this:


But planted in the ground and given time it can look like this:

[both of these photos from the MBG website]

This is a spectacular shrub and deserves the space it requires.