If drainage is a problem, plant daylilies in raised beds. The best time to plant daylilies is during early fall or early spring when soil temperatures are moderate. Daylilies will tolerate planting during any time of year. Plant daylilies 18 to 24 inches apart. Water plants thoroughly after planting, and continue to deep soak them at least weekly until established.
Daylilies usually grow adequately without fertilizer but grow best when lightly fertilized.
They prefer moderate nitrogen and higher rates of phosphorous and potash. Slow-release fertilizers are best for daylilies. Put down fertilizer in the early spring just as new growth commences, and again in midsummer. Make sure that the soil is moist whenever applying fertilizer. Mulch helps to conserve moisture in the soil and control weeds.