Why is dividing perennials beneficial to propagating them?
Division is both a propagation technique and a technique used to rejuvenate perennials or control their spread. Good candidates for division include clumps that have died out or become woody in the center, ones that are overcrowded and blooming less, and plants that have spread too far and are threatening to overtake their neighbors. Cool, rainy, or overcast weather is best for dividing plants because it reduces stress on the plants. Dividing a clump of perennials yields exact replicas of the parent plant, and full-size plants result much faster than propagating the plants from seeds.
