Yes, Natalie is correct, you are in zone 5b. I would not divide the dl's this year because it is too late in the season. If however, you do divide, mulch very well. You may also want to put bricks or stepping stones around the roots of the dl's. I was told (have never tried) that this will help get the dl's through the winter. Personally, I would wait until next May and then divide. I have some dl's that were purchased in 2006 and have never been divided. They should be divided, but they are doing fine. Daylilies multiply at different rates, so some dl's need to be divided more often.
