A third group blooms late summer to frost. Some varieties even rebloom. By selecting varieties with varying bloom times, gardeners can have daylilies blooming from late spring until frost. Daylilies can be propagated in two ways. The first is by seed.
Seed require a moist-chilling treatment, or stratification, for successful germination.
Stratification can be achieved by burying the seeds in a lightly moistened medium and placing them in the refrigerator for 6 weeks. Daylilies are most commonly propagated by division. Divide the clumps in spring or late summer when the plants are not actively flowering. Separate each plant into rooted segments. Each segment should have 3 shoots.