Posted: 28/11/2011 at 18:43
My daylilies are already quite tall, so if you have lots of growth on your plants lazygardener I'm not sure you'll be able to lift and divide without really damaging them.
I'd suggest waiting until NEXT February/March, and dividing and replanting if conditions are not too cold or wait (delay a little if they are, but complete the job in March before new shoots develop too much).
I'd always recommend that anyone gardening on heavy/clay/wet soil should delay dividing rather than doing this too early. Conditions will be warming-up through late March and into April, encouraging new root growth and fast establishment.