For the first time last fall, I dug up some dahlia tubers and divided them. There was a very small tuber that had a clearly defined "eye" (bud for a future stem), so I wondered if would bloom the same year or need another year to mature. I planted it and brought it inside and babied it through the "winter", and as you can see it grew quickly enough that it is already blooming.
I was a bit surprised; having divided the tubers back in late November (too late, actually, but it took me that long to get around to it), I forgot what it was. I thought it was going to be Bodacious, but it turned out to be Wheels. Wheels was one of my favorites last year--and one of the hummer's favorites as well.