This mysterious dahlia magically changes colors from light purple to white within a single season. Who Dun It arrives on the scene as a 6″ fully double bloom in a luxuriant shade of lilac, but quickly transforms to mauve, then lavender-blue, while white petals take over in the final days. Sturdy, vigorous plant produces dozens of large blooms during the long growing season. Makes a great cut flower, as well as a fine decorative statement in borders and mixed beds.