The are such wonderful cut flowers, though they don't last for a long time, but you can see how "dinner plate" dahlias get their name. This "White Perfection." It displays well
with cobalt blue.
Last year I bought two window box size potted dahlias at Wegmans. They were marked as "annuals," but I hoped that if I dug up and stored the tubers with my other dahlias they might come back. I was far from disappointed. They obviously are quite happy!
And as a surprise September bonus these are the first blooms from irises that I liberated from a neglected garden in a public area next to my house. They were buried under taller plants and crowded beyond bloom. I spread clumps around the gardens as a border accent. I did not expect a fall bloom. SDB I think but perhaps MDB or a species.