Daylilies do very well when planted outdoors. They are not fussy about soil, they can tolerate shade, and they are naturally resistant to insects. Daylilies are difficult to grow indoors. They require extensive artificial light and regular fertilizing to stay healthy. Indoor daylilies are unlikely to bloom at all.
If you purchased potted plants, give them a thorough watering with this solution the night before you plant.
If the soil is still wet when you return to water, wait another day or 2. Although these plants can withstand droughts, they will make fewer and smaller flowers if they are allowed to dry out. Overhead watering may cause spots on the flowers. Pour water directly into the soil, not over the plants themselves.
Give the first application in the spring when the plants are 2-4 weeks old. Provide a second application towards the end of the summer. Water-soluble fertilizer can be purchased at most garden stores.