Perennials

Heuchera 'Obsidian'

Obsidian coral bells

Also known as: Alumroot

Photo(s) courtesy of TERRA NOVA® Nurseries, Inc. www.terranovanurseries.com. cultivar photograph; surrounding plants are not included.

Glossy, nearly black leaves keep their rich color through the growing season. A compact foliage accent beside brighter perennials. Garden uses include foliage contrast, edging and containers. Keep the crown at soil level; do not bury it.

At a glance

Sun: Full sun to part shade; shelter from intense heat
Mature size: Height: 10 in.; flowers to 24 in. · Spread: 16 in.
Water: Moderate; well drained
Hardiness: USDA zones 4–9
Bloom: Small, secondary to foliage; May–June.

Sizes & prices

#1$18.99

Catalog updated September 8, 2026. This is not a live stock count; please call to confirm availability and price.

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Resistance & tolerances

Drought: Some tolerance once established; water during heat.
Wet soil: Avoid soggy soil, especially in winter.

Pollinators & wildlife

Attracts: Hummingbirds

Seasonal interest

Foliage: Evergreen in mild conditions; semi-evergreen in colder sites.

Growing & care

Soil: Organic soil with good drainage.
Cleanup: Trim damaged foliage in early spring; retain healthy leaves.
Maintenance: Remove damaged leaves and faded flower stems. Check for frost-heaved crowns in spring and reset them at soil level. Divide aging clumps in spring.

Sources & photo credits

Terra Nova Nurseries

Royal Horticultural Society

Photo: TERRA NOVA® Nurseries, Inc. · Authorized product promotion

Image notes: Photo(s) courtesy of TERRA NOVA® Nurseries, Inc. www.terranovanurseries.com. cultivar photograph; surrounding plants are not included. Uncropped.

Reviewed September 19, 2026. Growing conditions vary by location.