How To Remove Mold from Dahlia Bulbs


Dahlia bulbs are often dug up and stored over the winter to be replanted when the weather warms. If storage conditions are too damp, bulbs will develop mold. You should always check your bulbs at least once a week to make sure they aren't getting moldy. If mold is left on a bulb too long, it will spread to other bulbs. Removing the mold is typically quite easy and takes little time.

Step 1

Put on your garden gloves. If you are sensitive to molds, you may wish to wear a dust mask to do this as well. Take the affected dahlia bulbs outdoors.

Step 2

Brush mold off of one bulb at a time, using a soft-bristled brush, as recommended by the Portland Dahlia Society. Next, spray the bulb with a household disinfectant spray to kill remaining spores that you can't see, as recommended by

Step 3

Place each now-clean bulb in a clean box. Store the bulbs in an area with less humidity than previously, if possible. If it is not possible to move the bulbs to a dry area that is still cool enough for the bulbs, then you'll need to check on them more frequently than once a week to catch new mold growth. recommends storing the bulbs where it is between 40 and 50 degrees Fahrenheit.

Things You'll Need

  • Garden gloves
  • Dust mask
  • Soft bristled brush
  • Clean box
  • Household anti-fungal spray


  • Portland Dahlia Society: Care for Dahlias
  • Dahlia Divas: Storing Dahlias
Keywords: moldy dahlia bulbs, remove bulb molds, clean dahlia bulbs

About this Author

Corey M. Mackenzie is a professional freelance writer with knowledge and experience in many areas. Corey received a B.A. with honors from Wichita State University and has been a writer for over two decades. Corey specializes in pets, interior decorating, health care, gardening, fashion, relationships, home improvement and forensic science. Corey's articles have appeared in Garden Guides, Travels and other websites online.