Dahlias: How to dig & store them for winter

yellow dahlia flower by Stofko
Photo by Connie Oswald Stofko

Dahlias are beautiful flowers that you can enjoy year after year, but the tubers don’t fare well if you leave them in the garden over the winter.

You should dig your dahlia tubers up before there’s a hard frost, according to information on dahlias from the National Garden Bureau, a non-profit organization for the gardening industry. A hard frost occurs when temperatures drop below 28.

A good indication of when to dig your tubers up is when the plant starts to turn brown and die back.

Get information on digging up, cleaning and storing dahlia tubers here.

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8 Comments on “Dahlias: How to dig & store them for winter

  1. Re: storing dahlia tubers, I thought they needed to be stored in peat moss. There was no mention of it in the article. Has that method been discarded? (from a long-time dahlias-fan!!) Judy W. in South Wales

  2. I have never used peat moss but I have a root cellar that keeps them around 50 degrees. Use cardboard boxes and laundry baskets.

  3. Judith, if storing them in peat moss has worked for you, you can continue doing that. But it sounds like skipping peat moss also works!

  4. Peat moss ladies? Please look in to the environmental damage we cause by buying peat moss, is being vanish not because is bad but because we do a lot of damage to the environment and to a ecosystem by buying it, companies dont care they just want the money but I think is fair to say that north America is well behind in doing something about it, dont take my word but inform yourself in the subject.
    Happy gardening ladies 😍🥰

  5. I had some years ago that I neglected to dig up, hence they died. I purchased new one last spring, beautiful. I recall using a bulb dust to prevent fungus during storage. I called several nurseries and none of them carried it. I don’t see any mention of it in these comments about storage. Is it not necessary?

  6. Donna, many people add sulfur powder to their storage material but be sure to wear a mask while using because it is terrible for your lungs. Sometimes, making sure your tubers are dried for a few days is all you need. I have seen several sources that say sprinkling with cinnamon also does the trick.

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