Posted: 27/09/2016 at 23:43
I will always argue that waiting for frost to blacken dahlias is plain silly. I recently attended the local national dahlia collection sale where plants were in large greenhouses dying down???? They will not be blackened by frost ...in fact they will be grown on and sold next year. There you are, that's out of the way!
so Helen, yes you can cut your dahlias down now and they will be just fine. The critical thing is to keep them frost free over winter.
Next year give us feedback Helen and let us know how your dahlias are doing. I am very confident they will be thriving
good luck with your move