How to Grow Heuchera (Coral Bells)

Heuchera, commonly called coral bells, is grown above all for its spectacular foliage. The rounded, often ruffled leaves come in an astonishing range of colors — lime green, caramel, amber, peach, deep burgundy, near-black purple, and silvery, veined patterns — and in many climates they hold their color right through winter, giving you year-round interest from a single tidy mound. In late spring and early summer the plants send up airy wands of small bell-shaped flowers, usually in white, pink, or coral red, that hummingbirds love. Compact, versatile, and at home in borders, containers, edging, and woodland gardens alike, heuchera is one of the most useful perennials you can plant. This guide covers hardiness, planting, spacing, care, and how to divide and rescue plants that heave out of the soil over winter.

Hardiness Zones and Light

Most heucheras are hardy in USDA zones 4 through 9, though hardiness varies by variety, so check the label for the specific cultivar. They are cool-season plants at heart — many North American species hail from rocky woodlands and slopes — and they appreciate climates with distinct seasons.

Light needs depend largely on leaf color, and getting this right is the secret to great heuchera. Part shade is the safe, ideal choice for nearly all varieties: enough light to bring out the colors, with protection from harsh afternoon sun. As a rule, dark-leaved types (deep purple, burgundy, near-black) tolerate and even want more sun to keep their rich color, while light-colored types (lime, amber, silver, pale peach) want more shade, as their foliage scorches easily in strong sun. In hot southern climates, give all heucheras afternoon shade. In cool northern gardens, most can take more sun as long as the soil stays moist. Too much deep shade, on the other hand, mutes the colors and produces floppy, sparse growth.

Soil and Planting

Heuchera demands rich, humusy, well-draining soil. This is the most important factor for survival: coral bells absolutely will not tolerate heavy, soggy, waterlogged soil, which rots the crown and is the most common cause of death. If your soil is heavy clay, amend it generously with compost to improve both drainage and fertility, or plant in a raised bed or container. Slightly acidic to neutral soil is ideal. Plant in spring or early fall so roots establish in mild weather.

Dig a hole the depth of the root ball and twice as wide. The critical detail is planting depth: set the plant so the crown — where the leaves emerge from the roots — sits right at the soil surface, never buried. A buried crown holds moisture against itself and rots. Backfill with compost-enriched soil, firm gently, and water in well. A light layer of mulch helps retain moisture and suppress weeds, but keep it pulled back from the crown itself so the center of the plant stays dry and airy. Heuchera also grows beautifully in containers, where you have full control over the soil mix and drainage.

Note that heuchera tends to be relatively short-lived, often declining after three to four years as the woody crown lifts and the center thins — which is exactly why periodic division (covered below) is part of normal care rather than a rescue measure.

Spacing

Space heuchera plants about 1 to 1.5 feet apart, measuring center to center. Most varieties form mounds roughly 12 to 18 inches wide, so this spacing lets each plant develop its full rounded shape while the clumps gradually knit together into a colorful, weed-suppressing groundcover. Good spacing also keeps air moving around the crowns, which helps prevent fungal problems and crown rot in humid conditions. For edging a path or massing for color, plant in groups; for containers, a single heuchera makes a striking centerpiece or a bold “thriller” among trailing companions.

Watering and Care

Water regularly during the first growing season to establish a strong root system. Once established, heuchera is fairly drought-tolerant and needs only moderate water — aim for consistent, moderate moisture without ever letting the soil stay saturated. About an inch of water a week in the absence of rain is a good target, scaled back in cool weather and increased during heat waves, especially for plants in sun or containers. The balance to strike is moist-but-never-soggy: too dry and the leaf edges crisp, too wet and the crown rots.

Feeding is minimal. A spring topdressing of compost or a light application of balanced slow-release fertilizer as new growth begins is plenty; heucheras are not heavy feeders, and excess fertilizer produces weak, floppy growth. Grooming is easy: pull or snip off any tattered, faded, or winter-damaged leaves in spring to make way for fresh foliage. You can leave the flower wands for the hummingbirds and their airy look, or cut them back after blooming to direct energy into the foliage and tidy the plant — either approach is fine. Coral bells are generally deer- and rabbit-resistant, a welcome trait in many gardens.

Dividing Heuchera

Because heucheras tend to be short-lived and gradually lift their woody crowns out of the soil, dividing every 3 to 4 years keeps them healthy, refreshes tired plants, and multiplies your stock for free. The best time is spring or early fall. Dig up the whole clump, then either pull or cut it into sections, making sure each piece has a portion of healthy crown and roots. Trim away any old, woody, leafless center, which will not regenerate well.

Replant the divisions promptly at the correct depth, with the crown sitting at the soil surface, in soil refreshed with compost. Water them in and keep them moist while they re-establish. Dividing not only rejuvenates the plant but is also the standard cure for the crown that has slowly worked its way up out of the ground over successive winters — replanting the divisions at the proper depth resets the clock.

Common Problems

Frost Heaving

The single most common and serious problem with heuchera, especially in cold-winter zones. Repeated freezing and thawing of the soil literally pushes the shallow-rooted crowns up and out of the ground, exposing the roots to cold and drying air and often killing the plant. Prevent it by applying a layer of mulch in late fall after the ground freezes, which buffers the soil temperature and reduces heaving. Each spring, check your plants: if a crown has lifted, gently press it back down and firm soil around it, or if it has heaved badly, dig and replant (or divide) it at the proper depth. A few minutes of attention in spring saves the plant.

Crown and Root Rot

Caused by soggy soil, poor drainage, or a buried crown. Symptoms are a mushy crown, collapsing leaves, and plants that pull out of the ground easily. Prevent it with well-draining soil, correct planting depth, and restrained watering. There is no cure for a badly rotted crown, so prevention is everything.

Scorched or Faded Leaves and Pests

Brown, crispy leaf edges usually mean too much hot sun (especially on light-colored varieties) or too little water; move light-leaved types to more shade and keep moisture steady. Washed-out, floppy growth means too much shade. The main pest to watch is the black vine weevil, whose grubs feed on the roots and can topple a plant; if a heuchera suddenly wilts and lifts easily, check for C-shaped white grubs in the root zone and treat the soil accordingly. Otherwise heuchera is largely pest-free.

Heuchera’s colorful foliage is a perfect foil for the feathery summer plumes of astilbe in a shady border, and the two share similar moisture and light preferences. For more perennials and shade-garden inspiration, explore our Plants & Flowers guides, and if you are planting up containers, our urban gardening section has plenty of small-space ideas.