I tend to leave them alone and then trim back in the spring. however if you like the tidy look then cut down late nov so there is a couple of inches of stalk left to mark their place.

Yes I agree, in the spring you will see new growth appearing amongst the dead stalks, that is a good time to remove the old growth, if you have cut back you just pull the dried stalks out in the summer or late spring.

I do cut mine back at this time of year, and then spread home-made compost around to feed the soil. The worms take it down for me. I also shift some clumps around, or split them, so it's easier when they're cut back.

Thank you all for your quick responses..........i will keep this all in mind,for
things to do, once i am back on my 2 feet once again!! `You have all been
very helpful... : ~ ))