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Success with Cuttings by Bill McClaren
(from The American Dahlia Society)

Dahlias can be propagated from seeds, tubers, or cuttings. Seeds will produce varieties different from the parent plants, so propagation from seeds is used primarily to develop new cultivars. Propagation using tubers is the method most commonly used by, and familiar to, dahlia growers. Tubers will produce a clone, or a plant exactly like the plant of the “mother” tuber. Propagation of dahlias by taking cuttings is the best method to increase stock of a favorite plant or to over-winter varieties that have tubers that are difficult to store.In addition, cuttings are clones of the mother tuber so they provide a quick and easy way to increase the stock from a single tuber. Cuttings transplanted to the garden produce healthy tubers that store well over the winter. Read More...