Dahlias are very beautiful and tender perennials, they can’t stand temperatures lower than + 9, so they should be carefully dug out of the ground and stored during winter time. Please, remember just one light frost will kill the foliage.
If you still feel like letting your dahlias spending winter in garden, think of protecting them as great as possible. Heap a 15cm (6in) layer of mulch on top of them.
As a rule these plants are carefully dig out the ground with a spade. Dahlia tubers should be dry and extremely clean, since any moisture or mud can make plants rot.
Cover your dahlias with potting compost and store them in a cool, frost-free place until spring.
