Last updated on June 30th, 2019
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You have to start by digging up your dahlias immediately after the first frost. The first frost will kill the leaves and stems. They will start to turn black after frost. This forces the tuber into dormancy for the winter and as soon as this happens you can trim your Dahlia back to anywhere between 5 cm and 15 centimetres. This will make it much easier to remove the roots.