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If you live in a place with cold winters, you have to dig up your dahlias and bring them inside for the winter. If you live in a place where it does not freeze during the winter, you can leave the dahlias outside. However you should mulch the area to protect them. until March when you remove the mulch and replant them.

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Do dahlias come back year after year, or do they need to be replanted annually?

Dahlias are perennial plants, meaning they come back year after year. They do not need to be replanted annually.


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How do you take care of dahlia in Chicago?

Chicago is zone 6 but some of the suburbs are zone 5. Dahlias will need to be dug up after they turn black from a killing frost. Store the tubers inside at 50 degrees Fahrenheit. Plant them in April or May when the ground is warm, 60 degrees.