Plant your day lilies in full sun or partial shade. The dappled shade under a pine tree also works well, according to the University of Florida. Day lilies that are dark in color should be planted in partial shade, while lighter-colored flowers do best in full sun.
Work 3 to 4 inches of organic compost into the soil of the entire planting site. If you use fertilizer, choose one that is high in nitrogen. Then, dig a hole just a bit larger than the root ball of the day lily. Create a slight mound of soil in the hole.
Inspect the day lily and remove any damaged or broken roots. Rest the roots on top of the mound and spread them out over the mound. Fill in the hole with the removed soil. The crown of the day lily should be even with the surface of the soil.
Water the newly planted day lily thoroughly. Cover the area around the day lily with 2 to 3 inches of mulch. Pine straw or shredded pine bark is best, according to the University of Florida. This helps the soil retain moisture and stifle weed growth.
Keep the planting site moist until the lilies are actively growing, then ensure they get between 1 and 2 inches of water each week. Water in the early evening for best results. Fertilize in early spring, mid-summer and early fall with a fertilizer high in nitrogen. Use about 1 lb. of fertilizer for every 100 square feet of the planting site.