Dahlia imp Single White 08-01-2019DianeComments are closed Tree Dahlias grow between 3-4 m and have large bunches of flowers mid to late autumn. They are herbaceous. Unlike many other Dahlias they do not need to be lifted in winter. Tall bamboo like stems.Single white flowers in Autumn Category: Shrubs Related products Breynia Ironstone Range Indegofera Decora Cotinus Grace- Smoke bush Dahlia imp Single Pink