Now is the perfect time to divide perennials. You can do this every 2-4 years to prevent overcrowding, (or just to increase your plant inventory!) but also to ensure the plant maintains its vigour. Essentially - dig up - divide with a spade, lever apart with garden forks or even an old bread knife or saw. Replant one in the original spot and the others wherever you wish. Water well! This list of perennials you can divide is long - but here's a few to get you started: Agapanthus, Anemone, Aster,