When pest infestations are severe or where large numbers of plants are involved, chemical control may be needed. For recommendations on selection and application of insecticides and miticides, contact the cooperative extension service in your county. Although daylilies can be grown readily from seed, variation in seedling populations is great. Therefore, named varieties and selected clones must be propagated vegetatively to maintain a true line. Seeds of daylilies germinate in 10 days to 2 weeks and require no special treatment.
Seeds are ready for harvest when the pods turn brown and start to split.
Soil should be carefully watered and kept moist while seeds are germinating. Germinating containers should be placed in a shaded location and covered with glass or clear plastic to prevent the soil from drying out. Some growers prefer to leave the seedlings in flats until they are large enough to set out in nursery beds. Daylilies usually take 2 years from seed to flowering. Plant division is best done immediately after the flowering season.