Botanical Name: Heuchera ‘Obsidian’ Common Name: Coral Bells Hardiness Zone: Perennial in Most Climates (USDA Zones 4–9) Size: 8–12" Tall × 14–18" Spread Growth Habit: Dense, Low-Mounding, Well-Branched Habit Sunlight: Partial Shade to Full Sun (Best Color in Morning Sun / Afternoon Shade) Soil: Well-Drained, Organic-Rich Soil Water Needs: Moderate; Consistent Moisture Preferred Bloom Season: Late Spring to Early Summer Fertilizer: Light Feeding in Spring Features: Jet-Black Foliage, Matte Finish, Excellent Color Stability, Evergreen to Semi-Evergreen Uses: Shade Gardens, Borders, Containers, Woodland Gardens, Dramatic Foliage Contrast

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See our complete Heuchera Growth & Care Guide for more in depth care details.

More About Heuchera ‘Obsidian’

Heuchera ‘Obsidian’ is considered the gold standard for black-leaved coral bells, featuring truly jet-black foliage with a smooth, matte finish. Unlike many dark varieties that fade to burgundy or bronze, ‘Obsidian’ maintains its deep black color throughout the growing season.

In late spring, slender flower stalks rise above the foliage carrying small, creamy-white blooms that provide gentle contrast without distracting from the foliage. The plant’s low, compact habit keeps it looking intentional and refined year-round.

Why We Like It (Our Trials)

In our trials, ‘Obsidian’ has shown outstanding color retention, even in summer heat and humidity. It forms a tight, uniform mound and holds up well in both containers and in-ground plantings. We especially appreciate its role as a design anchor. The black foliage makes surrounding plants look brighter and more vibrant, whether paired with silvers, chartreuse, whites, or bold flowering perennials. It’s one of the most reliable dark-foliage plants we grow.

Obsidian vs. Other Heuchera Varieties 

‘Obsidian’ is the gold standard for black foliage Heuchera, delivering deep, glossy, near-black leaves that anchor garden designs. Compared to Black Forest Cake, Obsidian is cleaner and darker, with fewer brown undertones. It provides stronger contrast than purple varieties like Forever Purple, making it ideal as a grounding plant. Obsidian is frequently used to make brighter colors such as Fire Alarm, Lime Marmalade, and Georgia Peach pop.

From a design perspective, Obsidian functions as a structural element rather than just a color accent. Obsidian pairs seamlessly with Berry Smoothie, and other high-contrast Heuchera selections. Its refined foliage makes it especially popular in modern landscapes, containers, and formal borders.