Daylily clumps can grow anywhere from six inches to five feet tall. Since they can reach a span between two to four feet wide, space only about three feet apart (or for a more dramatic show in the early years, space about 18 inches apart). Plant roots in early spring or early fall a month or more before a hard frost. In northern gardens it is best to in the spring to declare good planting during the summer before harsh winters come.
To plant, measure a diameter of two feet and loosen this area of soil. Dig a hole a foot deep, the size of the root. Amend with compost if the soil is poor. Plant the crown about an inch below the soil line, angling the bulbous roots outward and slightly downward. Add soil evenly and press to get rid of any air pockets. When the hole is two-thirds full, water generously. Fill the rest of the hole so that the crown is about an inch below the soil surface. Water again.
Moonlit masquerade lilies with cream and purple flowers close-up
The fir tree / Evgeniya Vlasova
Isolde daylily close-up with purple and yellow petals
Flying saucer daylily with yellow petals and buds close-up
Sherry fair daylilies with pink petals close-up
Slider daylilies with orange petals close-up
Daylilies love full sun, so make sure you get at least six hours each day. In extra hot climates, some afternoon shade will keep yours in good health (although do this knowing it may reduce the number of blooms your plant produces). Darker sorters prefer afternoon shade in warm climates to help retain their color.
Although they thrive in any soil, daylilies prefer to be planted in one that is fertile and loamy. Just make sure the soil is moist: sandy or clay soil may be too dry. Adding compost can help it retain moisture. Also, make sure the site is well-drained to prevent root rot.
Water regularly during the first growing season. Go ahead, water only if the weather is very dry. Mulch helps retain moisture in the soil, plus it protects plants in colder winter climates.
Temperature and humidity
This is a tough plant that can withstand most temperatures and a wide range of humidity levels. It would prefer about an inch of moisture per week, but it can also get through some dry spells relatively unscathed.
Most daylilies do not need fertilizer. Instead, add compost each season to provide extra nutrients to the plants and improve the soil.