Usually the decline in flowering can be attributed to congested root growth or overcrowding. Lifting and dividing the clumps into smaller divisions and replanting will rejuvenate daylilies for increased bloom and overall vigor. This can be done either in early spring as the plants emerge from dormancy or at the end of the summer, early fall, following the flowering period. Another possible cause of decline in flowering is that the daylilies are not getting as much sun as when they were originally planted, due to the maturation of trees or shrubs nearby.
For more information, please see the PlantTalk script "Daylily."
