This is the perfect time to divide perennials. Hostas and many other plants will benefit from dividing.
Get into the soil, dig around the plant then pull the whole thing out and brutally cut it in half or into quarters.
Most perennials will be revitalized by the dividing. It’s a great way to make more plants, trade with friends or can be the perfect gift for fellow gardeners.
Here’s a good list of perennials that explains how often to divide them.
Yarrow (Achillea species and hybrids). Divide every 2-3 years in the spring. Discard woody core.
Columbine (Aquilegia species and hybrids). can be divided for propagation in the spring. Plants may take a while to recover after division.
Asters (Aster species). Divide every 2-3 years in the spring or fall. Replant small healthy pieces from outside of the clump.
Chrysanthemum (Chrysanthemum species) Divide every 2-3 years in the spring when new shoots are 3-6 inches tall.
Shasta daisy (Leucanthemum and hybrids) Divide every 2-3 years in spring or fall when new foliage is 3-6 inches tall. Discard central portion.
Coreopsis (Coreopsis species). Divide every 2-3 years in the spring or early fall.
Pampas Grass (Cortederia sellonana). Plant 6 feet apart and they may never need division.
Delphinium (Delphinium species and hybrids) Divide every2-3 years in the spring
Bleeding Heart (Dicentra eimia or D.spectabilis). Divide every 3-4 years in the spring. Handle carefully as roots are brittle.
Ferns (various genus and species). Many grow from rhizomes. Propagate by root division or crown division.
Hellebore (Helleborus species and hybrids). Allow 3-5 years before dividing when in bloom or immediately after they stop flowering.
Daylily (Hemerocallis species and hybrids). Divide every 4-6 years in the spring or immediately after flowering for spacing and for heavier blooms
Hosta (Hosta species and hybrids). Plant at least three feet apart and they will never need division.
Red-Hot Poker (Kniphofia species and hybrids). Divide for propagation in the spring or fall, otherwise they do not need division.
Monarda or Bee Balm (Monarda species and hybrids). Divide every 3-4 years in the spring.
Phlox (phlox species and hybrids). Divide in later spring after flowers have faded. Before replanting, cut foliage down to half current height. The root system is sparse.
Sedum or Stonecrop (Sedum species and hybrids). Divide only for propagation in the spring.
Sempervivum or Hen and Chicks (Sempervivum species). In the spring or fall remove new offsets around crown margins. Cut the lateral stem between the parent and offshoot. Allow the cut portion to dry and form a callus before covering with soil.