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Can you overwinter dahlias? I live in Southeast Alaska and have 24 plants in my flower box coming up to my main entry to the house. I would like to replant them next year if I can get them through the winter months. Thank you.
Dahlias will not withstand the freezing cold winters. They need to be dug up and stored out of the freezing temperatures until spring. You can then replant them and enjoy the blooms again.
The key is to let them dry before you store either on paper or a wire dust with fungicide for extra safety and place them in a dry box or paper sack with dry sphagnum moss you get at the garden center. Keep them dry and plant back out in the spring.