What lilies need
Set bulbs in the ground immediately after purchasing them (wait until the ground thaws in cold climates).
Planting: Choose a site in full sun or dappled shade with well-drained soil. Locate bulbs away from foot traffic to protect fragile stems and flowers. Dig holes 6 to 7 inches apart and 8 inches deep; position bulbs with pointed side up. Refill the hole and water to settle the soil. Mulch to keep the soil damp and bulbs cool.
Fertilizing: In spring, top-dress the soil with a low-nitrogen fertilizer.
Watering: Most types of lily bulbs never go dormant, so water regularly during the growing season, then occasionally the rest of the year. The exception is Humboldt lily ― allow it to go dry during summer dormancy.