Posted: 23/08/2013 at 13:36
Clueless,,gently lift each dahlia stem and tie up to a cane. If you put 3 canes around your plant and with a length of string lift each dahlia stem and tie it in you can then see what you have that's intact. Those stems broken will be discarded. Those stems intact I would cut off the top most stems with flowers and buds. Make sure the newly supported dahlia is securely firm to continue growing and flowering.
I had a very tall yellow dahlia that was flattened by wind and rain when we had a thunderstorm 3 weeks ago. It is now looking wonderful....I did just as I suggest you do now.
Yes dahlias die back in winter. They form tubers during the summer. After the first frost has blackened the foliage lift your dahlia and take into the greenhouse. Let it dry off, upside down, and wrap in newspaper or fleece until the spring. It will grow away even bigger and better than this year