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How to Lift and Store Iris Rhizomes in Winter | Gardener’s Path

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2. Cure and Apply Fungicide

After they’ve been cleaned and trimmed, rhizomes need to cure before going into storage.

Spread them out on a flat surface like a tray or large piece of cardboard, allowing at least one inch of buffer space around each piece.

A close up horizontal image of iris rhizomes on a wicker surface that have been dusted with a fungicide for storage.
Photo by Lorna Kring.

If a second layer is needed, cover the first with lightly crumpled paper bags or newspaper before layering on top.

Place in a dark, dry, and warm location with good air circulation – the ideal temperature for curing is around 65 to 70°F.

Cure for two weeks, then coat with powdered garden sulfur or another antifungal agent to prevent disease, infestation, and rot.

A close up vertical image of a bottle of Bonide Sulfur Plant Fungicide isolated on a white background.A close up vertical image of a bottle of Bonide Sulfur Plant Fungicide isolated on a white background.

Bonide Sulfur Plant Fungicide

Bonide Sulfur Plant Fungicide is available at Arbico Organics

3. Wrap for Protection

After curing and dusting, the final step is to wrap each plant individually in a piece of newspaper and place it in a box for storage.

A close up horizontal image of iris rhizomes set on newspaper to be wrapped up ready for storage.A close up horizontal image of iris rhizomes set on newspaper to be wrapped up ready for storage.
Photo by Lorna Kring.

The box can be cardboard, rattan, wicker, a wire basket, or one made from some other type of breathable material.

Avoid plastic, because it doesn’t allow for adequate air circulation and can promote rot.

If a second layer is needed, lay down some lightly crumpled newspaper first before adding more.

4. Place in Storage

Place the box in a cool, dark, and dry location with consistent temperatures between 40 to 50°F.

Temperatures below 35°F can kill the rhizomes. Above 50°F, the warmth can cause moisture loss and dehydration.

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Lorna Kring

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