Daylilies (Hemerocallis) can easily triple in size from season to season. Proper spacing when planting daylilies is crucial so the plants can reach their full potential. Overcrowding can result in smaller plants and fewer blooms as the plants compete with each other for nutrients and moisture. Daylilies should be planted in the early spring or fall.
Locate the area where you plan to grow your daylilies. Viable sites are ones that have well-draining soil and that receive full sun to partial shade. The size of the planting site will be dependent on the number of bulbs or plants you are planting. As a rule, bulbs and plants should be no closer than 18 inches.
Determine if you are going to dig up and divide the plant in the next three years. If so, plan to space your daylilies (plants or bulbs) 18 to 24 inches apart. If you do not plan to dig up and divide your lilies, space the bulbs or plants 30 to 34 inches apart.
Dig planting holes for plants 6 inches wider than the root system and as equally deep. Dig planting holes for bulbs to a depth and width of 2 inches.
Place the plant into the hole and backfill with soil. If planting bulbs, place the bulb into the hole with the eye facing up and backfill the hole with soil. Repeat the process until you have planted all of your plants or bulbs.
Water the planting site thoroughly. Plan to water the site weekly unless you receive an inch of rainfall.