I have just read some pretty bad advice on over-wintering dahlia tubers. Basically suggested putting them in a box with dry compost (OK so far) and then putting them in the garden shed until you are ready to bring them on next spring, that's a really bad idea!
The garden shed (or garage) is a bad place to keep tubers over winter, unless it is heated, as sheds and garages are not frost free and especially so with the intense cold of the last few weeks.
Over-wintering dahlia tubers is the most difficult aspect of growing these fabulous flowers. Too cold and they rot, too hot and they shrivel and dry out; 4 – 8 C is ideal. They should also be inspected regularly and any damaged parts removed. Dusting with flowers of sulphur is a good plan.
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