See the links below for information on digging and storing tubers.
Beautiful Tubers – Photo by Linda Holmes-Cook
Digging, Dividing, and Storing Tubers
Cutting tubers – picture gallery
Putting Your Dahlias Down for a Long Winter’s Nap (a Pictorial)
Connie’s Dahlias – Splitting Tubers (Photo Album)
What Does a Novice Dahlia Grower Do after Frost?
No Fuss: Store Your Tubers in Plastic Wrap
Elkhart Dahlia Society Video: Digging Tubers
YouTube Video: Digging and Dividing Dahlia Tubers