How to Divide Iris

By Editorial Assistant: Emily VanSchmus
June 28, 2016
Iris—especially the reblooming varieties—can be so energetic that crowd control becomes necessary after a few years. This is your guide to dividing an iris.
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Time to divide

When clumps of iris start elbowing each other for room, blooming might be affected. Dividing them allows your flowers to rejuvenate. Here's what you'll need:Garden forkGarden glovesPowdered dolomitic limeFertilizerShovelTrowel 

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Step 1: Dig up iris

When iris clumps get too dense, it's time to divide. Using a garden fork, dig deep beneath the clump and dig it up. 

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Step 2: Pull apart

Pull the iris crowns apart, separating as many pieces as possible without damaging the roots. With rebloomers, the foliage should not be cut back after spring blooming.

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Step 3: Fertilize

Wearing gloves, sprinkle one cup each of dolomitic lime and fertilizer onto the soil. Work it well into the soil. 

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Step 4: Replant

When replanting, dig a deep hole (8 inches or more) and angle the roots straight down rather than splaying them out. New growth will come from the heel of the crown, so face them accordingly. 

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Step 5: Water

Firm the soil around the rhizome and roots, then water the transplanted clump generously. If precipitation doesn't oblige in a week, water again, but don't overdo. Irises dislike overwatering. 

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By Editorial Assistant: Emily VanSchmus