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To divide dahlias, keep in mind that they hold together in a fan shape. All of the growth "eyes" will be clustered tightly together in the middle of the fan. Use a sharp knife to cut them apart. Make sure you have at least one eye per division. Allow the cuttings to dry out in the air for about 30 minutes prior to replanting them. This will allow the wounds time to seal up and it will cut down on infection and rot.