How to Grow Heuchera
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How to grow heuchera, also called coral bells or alumroot, comes down to light, drainage and division. Heucheras are grown for their colorful leaves, and most do best in partial shade in soil that drains well. Four pages guide this plan: UC Master Gardeners in Tulare and Kings Counties, Iowa State University Extension, NC State Extension and the Royal Horticultural Society. They agree on shade and drainage, and they differ on division timing and mulching.
NC State says heucheras are short-lived perennials unless they are divided regularly, so division belongs in the ongoing care plan.
Quick answer
- Give heucheras partial shade or dappled light and well-drained soil, as Iowa State and the RHS describe.
- Plant crowns at or slightly above soil level, because the RHS says heucheras rot if the crown is buried.
- Mulch heavily after the first hard frost in fall, since new plants can heave out of the ground, as Iowa State advises.
- Divide the clump every three to four years and discard the old woody center, following the RHS guide.
Know the plant and its leaves
NC State describes alumroot as a genus of nearly 50 herbaceous perennial groundcovers native to North America, in the saxifrage family. It says they are grown mainly for their foliage. The RHS says heucheras form low, neat mounds, generally 20 to 30 centimeters, or 8 to 12 inches, tall, with evergreen leaves that give interest all year round.
The leaves come in many colors. Iowa State says they can be green, red, orange, burgundy, silver, yellow, peach or variegated. UC Master Gardeners list lime green, peach, gray, green and deep purple, and they note that many leaves have contrasting veins.
The flowers are a bonus. Iowa State says the flowers come in red, pink, white or combinations of those colors. UC Master Gardeners describe the flower stems as delicate, wand-like stalks lined with small bell-shaped flowers that rise well above the foliage.
Choose light that protects the leaves
Light sets the leaf color. NC State says alumroot can be grown in sun or shade depending on the variety, and that many varieties develop their best leaf color in full sun. The RHS says most heucheras thrive in partial or dappled shade, where their bright leaf colors are most valuable. Its guide adds that darker-leaved cultivars can often tolerate more sun, while paler leaves can get bleached or scorched in a bright spot.
UC Master Gardeners say partial shade rather than dense shade is best for intense leaf color, plant growth and flowers. The page describes morning sun and afternoon shade as the arrangement that works best for most varieties in a hot valley climate. Iowa State says most heucheras grow best in partial shade to full sun in Iowa, so the range is wide.
In strong sun, watch for leaf scorch. NC State says leaf scorch can be a problem for plants grown in full sun during hot, dry conditions. The RHS points to the same risk for paler cultivars.
Pick soil that drains and holds organic matter
Drainage comes first. The RHS says heucheras need well-drained soil that does not stay soggy, because damp conditions can lead to rotting. If your soil is waterlogged, the RHS suggests planting in containers or raised beds.
NC State says heucheras dislike heavy clay, and that they prefer moist, well-drained soils amended with organic matter, such as leaf compost or pine bark fines. UC Master Gardeners say heucheras do best in moist, rich, organic soils. For a soil mix for raised planters, see best soil for raised planters.
Only one of the four pages gives a pH. NC State says heucheras prefer a slightly acidic pH. Iowa State, UC Master Gardeners and the RHS do not state one, so readers should not assume a number from the other pages.
When and how deep to plant
Spring and autumn are the usual planting times. The RHS says they are the best times, when the ground is moist and warm and the plants settle in easily. It adds that heucheras can be planted at any time of year, as long as the ground is not frozen in winter or parched in summer. NC State says late fall or early spring is best.
Fall planting has a practical reason, according to UC Master Gardeners. A fall planting gives the roots time to establish over winter and spring, before summer heat arrives. The same page says to plant crowns slightly above soil level to allow fast drainage.
Depth is the detail most likely to cause rot. The RHS says to position plants at the same level they were growing, or slightly higher, because heucheras rot if the crown is buried. UC Master Gardeners and the RHS agree on this point.
Summer planting needs more water. The RHS says heucheras will struggle to get established in hot, dry conditions if planted in summer, so take extra care to water them regularly.
Water through establishment and after
Newly planted heucheras need steady water. The RHS says to water new plants well to settle them in, and then to keep watering regularly for at least the first growing season. Iowa State says the plants have shallow root systems and may need supplemental water during establishment.
After that, the rules loosen. The RHS says established heucheras should need watering only during long dry spells. UC Master Gardeners say the plants are somewhat drought tolerant, but a consistent watering schedule gives better performance, especially in the summer heat of their valley.
Keep the foliage dry when you water. The RHS says to avoid wetting the leaves, because wet foliage can encourage fungal disease and rotting.
Feeding and mulch
Feeding is optional in borders. The RHS says heucheras growing in borders do not generally need feeding. To give plants a boost, it says you can apply a general-purpose fertilizer in spring and follow the dosage on the pack. None of the pages gives a fertilizer rate, and this guide does not add one.
Mulch is where the pages differ most. The RHS says to lay a thick layer of organic matter, such as garden compost, around the plants each spring, and that the mulch helps deter weed germination. Iowa State says to mulch heavily after the first hard frost in fall, because the freezing and thawing of the soil can lift plants out of the ground. The sources do not say whether one timing should replace the other.
Winter, frost and new plants
Heucheras are hardy. The RHS says they do not need winter protection. In colder regions, some leaves may die off over winter, but the plants re-sprout reliably in spring.
New plants are the exception. Iowa State says newly planted heucheras have a tendency to frost heave in their first winter, and that a couple of years after planting the root system should be fully established and less likely to heave. The RHS adds that heucheras are shallow rooted and can lift slightly over winter, especially on heavy clay soils. It advises checking plants every spring and replanting them if needed, so the crown sits just on the surface.
For a wider winter checklist that covers the bed as well, see the best way to prepare raised beds for winter.
Deadheading and tidy-up
Deadheading is optional. The RHS says you can deadhead flowers as each stem fades. Or, once the display is over, you can trim all the flower stems at the base. NC State says deadheading the spent flowers increases bloom production through summer and into fall.
Tidy the leaves when they need it. UC Master Gardeners say to remove old flower stems after bloom, and that cutting off older brown or wilting leaves in winter or early spring encourages new growth. NC State says that if the leaves appear ragged, you can remove all the foliage to stimulate new leaves.
Divide clumps to keep them vigorous
Heucheras need division to stay healthy. NC State says they are usually short-lived unless divided regularly, about every three or four years. The RHS says plants can become straggly or woody as they age and produce fewer leaves and flowers, so they are best divided every three to four years.
The RHS describes late spring as the easiest time, once growth has started. Dig up the clump and pull off several small, vigorous sections from around the edge. Each section needs several roots and two or three healthy shoots. Discard the old woody center of the plant, and replant the sections.
UC Master Gardeners give a different timing and interval. They say to divide mature plants in the fall, and to divide and replant the larger plants every two to three years. Their method is to dig the plant up with a trowel or hand shovel, pull it apart by hand or cut through the old crown with a sharp knife while keeping some roots, and replant the divisions as soon as possible with the crown at or slightly above ground level.
| Source | Division timing | Division interval | Mulch timing |
|---|---|---|---|
| UC Master Gardeners | Fall | Every 2 to 3 years | Not stated |
| RHS | Late spring, once growth has started | Every 3 to 4 years | Each spring |
| NC State | Not stated | About every 3 or 4 years | Not stated |
| Iowa State University | Not stated | Not stated | After the first hard frost in fall |
Varieties and species to look for
Iowa State names several durable varieties for Iowa: the old-fashioned coral bells, ‘Obsidian’ for dark foliage, ‘Green Spice’ for green leaves with dark central markings, and ‘Southern Comfort’ for large orange leaves. Those names give you a starting list rather than a full catalog.
Many cultivars come from a handful of species. Iowa State lists Heuchera americana, a Midwest native that grows 12 to 15 inches tall. It lists H. micrantha, which prefers good drainage and grows 12 to 18 inches, H. sanguinea, which grows 8 to 12 inches and is native to higher elevations in the Southwest, and H. villosa, which grows 18 to 24 inches and has larger leaves with velvety hairs.
UC Master Gardeners highlight California native types. ‘Lillian’s Pink’ has bright pink flowers that attract bees and hummingbirds and makes an excellent groundcover for small shady areas or borders. ‘Rosada’ is described as one of the best flowering perennials for dry shade. Heuchera maxima, the island alumroot, is described as a good informal groundcover for dry shade.
How we chose
We chose four pages. Each one opened with HTTP 200 on 2026-10-23 and was read in full. Two are university extension sources: the UC Master Gardener article, from the University of California Agriculture and Natural Resources program, and the Iowa State University Extension article. The NC State page is a plant profile from NC State Extension. The fourth is the RHS growing guide, from a public horticultural society. Each one covers light, soil, planting, care and division, so the comparisons are as close to like-for-like as the pages allow.
We left out a page that returned HTTP 403. The Clemson heuchera page returned 403, so it is not counted. Commercial pages in search results were not used.
What we could not verify
The sources are written for different climates. The UC article is for California’s San Joaquin Valley, Iowa State writes for Iowa, NC State covers North Carolina, and the RHS guide is written for the United Kingdom. Frost dates, heat and rainfall will shift the timing for your yard, so use these pages as guides rather than calendars.
What the sources do not say
The sources disagree on several points. Division timing differs: fall in the UC article, late spring in the RHS guide. The interval differs too: every two to three years in the UC article, and every three to four years in the RHS and NC State pages. Mulch timing differs between spring in the RHS guide and after the first hard frost in the Iowa State article. Only NC State gives a pH. None of the pages gives a fertilizer rate, and none names a pest treatment, so this guide offers neither.
Frequently asked questions
How much sun does heuchera need?
The RHS says most heucheras thrive in partial or dappled shade. UC Master Gardeners say partial shade rather than dense shade is best for intense color, growth and flowers. NC State says alumroot can take sun or shade depending on the variety, and that many varieties color best in full sun.
Why does the middle of a heuchera clump look woody?
The RHS says plants can become straggly or woody as they age and produce fewer leaves and flowers. Its advice is to divide every three to four years and discard the old woody center. UC Master Gardeners recommend dividing every two to three years.
Should heuchera be mulched in winter?
Iowa State says to mulch heavily after the first hard frost in fall, which helps prevent the temperature swings that can heave new plants. The RHS says to lay a thick layer of organic matter around the plants each spring. The two pages differ on timing, so the sources do not settle which is better.
Do heuchera need winter protection?
The RHS says heucheras are hardy and do not need winter protection. Some leaves may die off in colder regions, but the plants re-sprout reliably in spring. Iowa State warns that newly planted heucheras can heave out of the ground during their first winter.
When should heuchera be divided?
The sources differ. The RHS says late spring, once growth has started, every three to four years. UC Master Gardeners say to divide mature plants in the fall, every two to three years. NC State says about every three or four years.
Sources
- UC Master Gardeners, Tulare/Kings Counties, “Coral Bells are Sure to Delight”: https://ucanr.edu/sites/default/files/2025-11/Coral%20Bells%20are%20Sure%20to%20Delight%20.pdf (opened 2026-10-23)
- Iowa State University Extension, “Heuchera or Coral Bells”: https://yardandgarden.extension.iastate.edu/article/2021/06/heuchera-or-coral-bells (opened 2026-10-23)
- NC State Extension Plant Toolbox, “Heuchera”: https://plants.ces.ncsu.edu/plants/heuchera/ (opened 2026-10-23)
- Royal Horticultural Society, “How to grow heuchera”: https://www.rhs.org.uk/plants/heuchera/growing-guide (opened 2026-10-23)
