How to Store Dahlia Bulbs in Winter

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Dahlias (Dahlia spp.) are prized in many home gardens for their large, intricate blossoms. Available in a large range of colors and in giant and dwarf varieties, dahlias grace summer gardens throughout the United States. Hardy in U.S. Department of Agriculture plant hardiness zones 7 through 10, the bulbs -- which are actually tuberous roots -- must be properly dug and stored over winter in cooler climates. Proper storage ensures that they survive the cold months undamaged. Dahlias are then replanted in the garden the next year to bloom again.

How to Store Dahlia Bulbs in Winter
(Jeanne Studio/Demand Media)

Things You'll Need

  • Shears
  • Household disinfectant
  • Garden fork
  • Spade
  • Mesh bag
  • Box
  • Peat moss
  • Knife
  • Bucket
Step 1

Cut back dahlia stems to 6 inches tall after the first autumn frost blackens the leaves. Use sharp shears and sterilize the blades with household disinfectant before and after you cut back stems and remove remaining leaves. Dig dahlias immediately after the first frost. Additional frosts can permanently damage the roots.

Jeanne Studio/Demand Media
Step 2

Loosen the soil around the dahlia using a hand-held garden fork. Leverage a spade under the dahlia and gently lift its tuberous roots from the soil.

Jeanne Studio/Demand Media
Step 3

Hang the bulbs with the stems pointing down in a dry place for two weeks. Place them in mesh bags to keep the stems in place and allow air flow around the bulbs.

Jeanne Studio/Demand Media
Step 4

Fill boxes with dry peat moss. Place the bulbs in the peat moss so they aren't touching one another. Store in a dry, dark place at a temperature between 40 and 45 degrees Fahrenheit. Substitute dry vermiculite for peat moss if it is available.

Jeanne Studio/Demand Media
Step 5

Check the bulbs every two to four weeks. Look for soft spots, shriveling or other signs of disease or rot. Cut off any damaged parts with a sharp, clean knife sterilized with household disinfectant before and after you cut damage away.

Jeanne Studio/Demand Media
Step 6

Place any cut bulbs that have begun to shrivel in a bucket of water for 12 hours to rehydrate. Hang them for an additional two weeks so that excess moisture dries. Then return the dahlias to storage.

Jeanne Studio/Demand Media

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