The American Dahlia Society (ADS) website.
DAHLIAaddict is a database of dahlia varieties available for mail-order sale to the United States and Canada. It lists dahlia varieties alphabetically and provides a listing of North American dahlia growers and resellers with links to their price lists, as well as comparative pricing for each dahlia variety and a link to its photo. http://DAHLIAaddict.com
Dahlia Tubers and Splitting Guide from Summer Dreams Farm.