Digging Up Dahlias
I pulled up my dahlia plants a few weeks ago and have since stowed away their tubers for the winter months. The Colorado Dahlia Society has a very thorough and informative tutorial about dividing and storing dahlias, but I've never been so meticulous about the whole process. I basically just pull them up from the ground, clip off the stems and brush away the soil. Then I pack them in a bag with a few handfuls of mulch and put them away... in the bathroom closet.
A friend at the community garden suggested using the mulch. I think it helps protect the tubers from drying out. The majority of the ones I stored in this manner last year came back to life and bloomed beautifully this summer. Only a few of the smaller tubers didn't make it, and that's pretty much to be expected. Survival of the fittest. In fact, survival of any living thing that has spent six months hibernating my the bathroom closet is something of a miracle.