Dahlias:
After the top of the dahlias turn yellow or have been frosted, cut stalks to within six inches of the ground. Dig a circle around the plant one foot from the center and gently pry up the clump with a spading fork, shaking off loose soil. In handling, be careful not to damage the brittle tubers. Let the clumps dry in the sun for several hours.
From here on, experts differ as to procedure. Some favor dividing the clumps immediately to save storage space. Freshly dug tubers are easy to cut; it is also easier to recognize the buds at this time. Many experts, though, advise leaving clumps intact, since there is less danger of shriveling when stored in cellars. They divide the clumps in spring when the eyes start to grow.
To store whole clumps, cover with dry sand, sawdust, peat moss, perlite, or vermiculite; store in a cool (40° to 45°F) dry place. About two to four weeks before planting in the spring, separate tubers by cutting from the stalk attached to each tuber, which must have an eye or bud in order to produce a new plant. Place tubers in moist sand to encourage development of sprouts.
If clumps are divided immediately after digging in fall, dust the cut surfaces with sulfur to prevent rot, bury the tubers in sand, sawdust, or vermiculite, and store in a cool dry place.
