Posted: 13/08/2013 at 15:53
What you propose would work as long as the pots don't freeze. I aways remove the tubers from the pots so that I can check for vine weevil grubs at the roots, they love dahlias. I then wrap them up in newspaper and pack them in a cardboard box to store in the shed over winter. In the spring I repot them in fresh compost.