When dividing a hosta plant it is usually best to dig the entire plant up. After digging the plant u remove as much soil as possible from the roots by either shaking them or spraying them with a water hose. Revealed roots make it is easier to determine where to make the divisions. The clump may be tugged or pulled on or even forked apart to separate the roots. If the roots are entangled severely you can use a sharp knife to cut the divisions apart.
When looking for a section to divide look for a separate growing crown. The crown is the part of the plant where the leaves connect to the roots, and there will be several individual crowns on a mature hosta clump. The separation of each individual crown with roots will result in one new plant. If you want larger plants leave several crowns together.
Hostas can be divided any time the soil is warm enough to be turned. The key thing to remember is to provide enough water to the newly planted divisions so that they can reestablish themselves. Early spring divisions can be done before leaves emerge and late fall divisions can be done right after the first frost.
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