I could say this is simply a giant white dinnerplate dahlia and I wouldn't be wrong. And perhaps that is all I need to say when one stem with a 10" floret is enough to make a statement on it's own.
PACK OF 2 BARE ROOTS
Hardiness Zones: 3-10 Height: 36" Bloom Time: July - October
Sun: Full Sun Characteristics: Deer Resistant, Cut Flower
Planting Instructions: Plant bare roots 2" deep and 24-36" apart. Dig up in the winter in northern states. Dry the tubers outside for a few days then store them in vermiculite in a frost-free area.