I don't fertilize my dl's at all
Recommendation from Oakes
"Daylilies aren't picky about their fertilizer, and usually do well with any balanced fertilizer. We typically use a balanced mix, such as 10-10-10, of a granular fertilizer each spring, broadcasting it over the top of the daylilies. Slow release fertilizer, liquid fertilizer, compost or well-rotted manure are all good choices as well. It is always a good idea to have a soil test done, especially if you feel like you have an unusual soil situation. We recommend fertilizing in the spring after most of the risk of a hard frost has passed. Two other times you might consider fertilizing - before bloom season, perhaps with a high nitrogen-type fertilizer to promote lush growth and bloom, and in late summer or fall with a balanced fertilizer."
