How do you split and replant hostas?

Hostas have a clumping root system, so to divide a plant, simply cut through the clump with a knife from the crown down. You can also pry apart the root clump with garden tools, but this won't give you as much precision. Cutting through the roots is fine, as hostas roots quickly regrow once transplanted.

Can I split my hosta now?

Hostas are easy to propagate by division in spring, just as they're starting into growth. One large clump can be divided into several new plants. Potted up and grown on in a sheltered spot or cold frame, these new plants will be ready to plant out later in the year year.