Plants that actually reach their peak in October, at least in this part of the country, are few and far between, making them a real treasure to gardeners and garden visitors alike. One of my favourites is Allium thunbergii 'Ozawa' for its near electric-violet flowers in loose "balls" called umbels.
It is a dwarf variety introduced to North America by George Schenk, and likely named after the original selector. The species is also known as the Japanese Onion, although as far as I know, it is not used for any culinary purposes. It is native to low mountains in Honshu, Shikoku, Kyushu and extending from Japan into South Korea.
Unfortunately, this plant is relatively rare, although specialty mail-order and/or bulb companies might offer it on occasion.
Here's to dirt under your nails.
MPD, the coolplantsguy