When to Divide and Transplant Hostas
Although you can divide most perennials any time during the growing season, fall and spring are best because cooler temperatures and more ample moisture mean less stress for plants once they are divided and transplanted. Wait to divide plants until they are large enough to separate into multiple sections. This large clump of hostas can be turned into a dozen or more plants.
How to Divide Hostas
Begin by digging deeply around the perimeter of the plant with a shovel, then push down on the handle like a lever to lift the clump out of the ground. Note: Watering plants a day or two beforehand will soften the soil and make digging easier.
Once the clump is removed from the ground, use the shovel to split it in half to make it easier to work with. With smaller clumps, this may be the only step necessary before replanting. With larger, overgrown clumps like this, further dividing is necessary.
With a saw or serrated knife, divide each clump into small sections to be replanted. Discard any sections with dead stems or minimal roots (often found in the center of old perennials).
Each new section should have at least three sets of shoots arising from the root crown (where stems and roots meet). Note: If you can’t see the root crown, remove some of the soil and debris at the base of the foliage by hand or with a jet of water.
How to Transplant Hostas
Replant these small sections, allowing enough space for plants to mature. Note: If you are giving the divisions away, place them in old nursery containers and pack the roots with moist soil. Keep them watered and in the shade until they’re ready for their new home.
Water deeply after planting and weekly throughout the growing season if rainfall is lacking.