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Successional sowings can be worthwhile.
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As we grow quite a lot of dahlias, about 30 plants on the allotment, we decided a few years ago to leave them in the ground for winter. We just didn't have anywhere dry to store that number of tubers. This experiment was very successful and one that we have repeated over the years. We have lost one or two plants over this time but probably no more than we would have lost if we had lifted them. Indeed previously when we did lift them every year we actually lost more tubers.