Daylilies grow rapidly to form dense clumps. Division is not essential but may revitalize flowering if the plants have become crowded. Division is the usual way to increase your supply of daylilies. Dividing is usually done following flowering, but plants will tolerate division throughout the entire growing season. Lift the entire clump or cluster out of the soil with a garden fork.
Daylilies look best if given some grooming through the year.
During winter, remove any rotted or damaged foliage from around evergreen daylilies. Remove spent blooms and seedpods after summer flowering to improve appearance and encourage rebloom. Remove dead foliage from daylilies as they die back in the fall. There are thousands of named cultivars of daylilies. Because of the variety of daylilies available, they have developed a language of their own.