The daylily is a perennial flower that grows from underground roots that behave similar to bulbs. There are several thousand daylily cultivars. Many of these cultivars are hybrids which have been bred to create distinctive colors and appearances. The care and maintenance of hybrid daylilies does not differ much from standard daylily care, though certain aspects of planting and pruning require consideration.
Select an area in which you wish to plant the lilies. If you plant to harvest the hybrid daylily's seed pods for propagation, choose an area away from other lily plants. Also consider the plant's sunlight needs. Most hybrid daylily species require full sun for best growing results, although certain hybrids have been bred to tolerate partial shade environments. Consult the nursery or daylily specialist from which you obtained the hybrid plants if you are unsure of its specific light requirements.
Prepare the ground. Use a spade to break apart the soil into loose clumps. Add an inch of peat moss or compost to the soil and mix it in with the dirt.
Plant the hybrid bulbs. Bury them in the ground with their eyes---the small dots on the plant from which the daylily plant will grow---facing upwards. Sink the bulb to a depth where the eyes are 1/2 inch below the surface. If planting more than one hybrid bulb, separate each one by 12 to 18 inches. Cover with dirt.
Water the bulbs. Sprinkle with a garden hose or watering can. Keep the soil moist until the bulbs sprout, after which you may reduce watering to once or twice a day.
Add 2 to 3 inches of mulch around the daylily plant. This increases soil moisture retention and keeps down invasive weeds that may compete with the daylily for soil nutrients.
Fertilize the daylilies with a standard 10-10-10 flower fertilizer three weeks after the plant first starts growing. After the plant is established, fertilize once a year in the spring when it begins growing after emerging from winter dormancy.
Hybrid daylilies will begin producing flowers within four to six months after growing from a new bulb or regenerating after the winter. Unless you are planning to harvest the plant's seed pods, prune off dead and wilted flowers to encourage the plant to produce more blossoms. Seed pods will develop after the flower has wilted and fallen off on its own.
Prune the daylilies after the winter is over. Trim back dead foliage and stems after the season's last frost.