Dahlias are perennial only in the warmest areas of the United States, such as USDA zone 10b. In other areas, the plant's tubers can be dug up, stored over the winter and replanted in the spring after the last frost.
About this Author
Michael Logan is a writer, editor and web page designer. His professional background includes electrical, computer and test engineering, real estate investment, network engineering and management, programming and remodeling company owner. Logan has been writing professionally since he was first published in "Test & Measurement World" in 1989.