Q&A for How to Grow Dahlias

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How do you overwinter dahlias?

Lauren Kurtz
Professional Gardener
Lauren Kurtz is a Naturalist and Horticultural Specialist. Lauren has worked for Aurora, Colorado managing the Water-Wise Garden at Aurora Municipal Center for the Water Conservation Department. She earned a BA in Environmental and Sustainability Studies from Western Michigan University in 2014.

Lauren Kurtz

Professional Gardener

Expert Answer

In the fall before the first frost, but after the foliage has yellowed, remove the foliage and dig up the tubers. Let them dry out for several days before storing them. Place the tubers in a box with sawdust, peat moss, or newspaper. Keep them in a dark place with temps at about 40-45 degrees F.

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Question

Do dahlias come back year after year?

Lauren Kurtz
Professional Gardener
Lauren Kurtz is a Naturalist and Horticultural Specialist. Lauren has worked for Aurora, Colorado managing the Water-Wise Garden at Aurora Municipal Center for the Water Conservation Department. She earned a BA in Environmental and Sustainability Studies from Western Michigan University in 2014.

Lauren Kurtz

Professional Gardener

Expert Answer

Dahlias are hardy to USDA zone 8 and will regrow each year from the tubers. In climates that experience frost, the tubers must be removed from the ground in the fall and overwintered in a dark dry place.

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Question

What is the minimum temperature for planting Dahlia tubers

Community Answer

The soil should be roughly 60 degrees. If you plant the dahlias in soil much cooler than this, they may not successfully grow.

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Question

Should fertilizers be used for planting

Community Answer

Yes. You should add a fertilizer to the hole you dig for each tuber before planting the dahlia.

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