I recently replanted the Dahlias at the music school. I lifted them last November and stored the tubers indoors in an unheated room. What to do with Dahlias over winter is debatable. They may survive in the ground, then again they may get cold and damp and rot. Take them indoors and they may get too dry and shrivel up.

 These were on the dry side when I looked at them about a month ago so in the interim I put them in large pots of soil in the greenhouse and kept them well watered. This seemed to do the trick, they plumped up nicely and were starting to sprout.

 When lifting it's important to label which clumps are which because there's no way to tell from the tubers. Dahlias generally look best planted in groups of the same flower and foliage rather than mixing them up.

 Clumps can be divided before planting but it's vital to make sure each division has an 'eye'. A tuber without an eye will not produce a stem. I simply cut several clumps in half with a very sharp knife. I dug  the planting holes in advance and filled them with well rotted compost mixed with top soil to make a rich mix and gave the ground a good soaking after planting.