Michaelmas Daisy Pruning
Last Autumn I bought a few 9cm Michaelmas Daisies - Symphyotrichum novi-belgii 'Purple Dome'. I hadn't realised that they needed to be pruned back after flowering in the Autumn, and just assumed it was Spring I had to do this. At the moment they are very twiggy and look like they're possibly dead. However I'm struggling to find information on how they're supposed to look at this time of you. I've attached a photo below.
If anyone is in the know on these types of plants please can you let me know if I should prune them now, and if so how much? Or if not whether they look as they should do for this time of you.
Thanks for any help and advice,