Dividing Hostas in Summer: Risky but Doable

A Northern New Jersey gardener wants to divide overgrown backyard hostas in summer to fill a bare front slope, knowing it's not the ideal time.

Hostas Are Tough

Summer division can succeed if done carefully. The plants will look rough this year but recover.

Summer Division Protocol

1. Water deeply the day before.
2. Dig clumps with a fork, preserving as many roots as possible.
3. Separate by hand or knife into divisions with 3+ eyes.
4. Replant immediately in prepared, shaded soil.
5. Water thoroughly and mulch.
6. Provide temporary shade (shade cloth) for 1–2 weeks.
7. Hold fertilizer for 2 weeks.

Expectations

• Foliage may wilt or die back—new growth will emerge from the crown.
• Next year will be better; year after, outstanding.
• Don't buy new hostas—dividing saves money and builds skill.

Go ahead—hostas forgive summer division if you baby them afterward.