Asked how he produced such blooms with only a little fertilizer, he said it was a very wet spring and every time the spring was wet, he had the same results - spectacular blooms. So give plenty of water, at least 1 inch a week. Do not over water however, as daylilies do not like to have their roots immersed in water for extended periods of time. Give the soil a chance to drain well before you water again. You may also want to check out my hidden pot trick for a tip on how to help ensure even watering.
Fertilizer is important for healthy daylilies.
Proper feeding will result in more and larger blooms and the plants will be more vigorous. A few varieties showed very little increase, but the majority increased significantly. The biggest increase was almost 2.5 times the number of blooms as the previous year. If you're using chemical fertilizer, I recommend that daylilies be fertilized at least twice a year, once in the early spring when the daylilies begin their spring growth, and again at the end of the summer. Here in the south, where we have a long growing season, some recommend an additional light application a couple of weeks after the peak bloom season.