Good news, Creve Coeur dahlias can multiply, but as a gardener, you need to help. To encourage multiplication, it is recommended that you divide the tubers and replant them every few years. This will help to keep the plant healthy, promote better blooms, and increase the overall size of your Dahlia patch.
It is a simple process that can be done in just a few steps. Firstly, dig up the tubers after the first frost and let them dry in a cool, well-ventilated area for a few days. Once dry, cut the tubers into smaller pieces, each with at least one "eye" or growing point. Plant the pieces in well-drained soil, about 6 inches apart, and water thoroughly. Keep the soil moist and in a warm, sunny location until the shoots emerge. Once the shoots reach about 6 inches tall, they can be divided and replanted in individual pots or in the garden.