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Yes, you can. Usually,Yes, you can. Usually, dahlias are propagated from dividing the dahlia's clump of tuberous roots. That would be our preferred method. The reason to propagate from a cutting is to Propagating dahlias from cuttings is usually to preserve a valuable variety. You start roots indoors and take a cutting when the new shoots develop and there are two sets of leaves. Plant the cutting in a moist medium such as vermiculite at 1/2 inch to 1 inch deep. Keep the medium moist and warm at all times.