Divide perennials in early fall, a few weeks before frost. This allows plants to root before winter.
Identify perennials to divide. Daylilies, hostas, irises, and sedum are common. Look for overgrown, dead-center, or underflowering plants.
The day before dividing, thoroughly water the plants. Bring a sharp spade, garden fork, knife, and gloves.
Dig carefully around the plant's base to acquire as much root system as possible. To reveal the roots, lift the plant and shake off extra soil.
Split the root clump using your hands or a sharp knife. Each area needs robust branches and roots. Get rid of dead or unhealthy plant components.
Replant divisions immediately in prepared soil. Plant them at their previous depth. Avoid overcrowding by spacing them by maturity.