Ebony Spleenwort (Asplenium platyneuron): Petite, Evergreen Fern for Rocky Shade

Overview

Ebony spleenwort (Asplenium platyneuron) is a small, evergreen fern native to eastern North America and South Africa. Its **slender, wiry, dark brown to black stipes (stems)** give rise to narrow, once-pinnate fronds 6–18 inches long. The pinnae are slightly asymmetric, with a small basal lobe (auricle) on the upper side—a key identification feature. It forms loose tufts on rocky slopes, limestone outcrops, and well-drained woodland banks.

Key Traits

• Dark Stems: Ebony-colored stipes are diagnostic.
• Rock Garden Gem: Thrives in crevices and alkaline soils.
• Evergreen: Persists through winter in most of its range.

Culture

Partial to full shade; well-drained, neutral to alkaline soil (tolerates limestone). Drought tolerant once established. Excellent for rock gardens, stone walls, and alpine troughs. Hardy USDA zones 5–9.

Taxonomic Profile

Dainty, dark-stemmed, and rock-loving, ebony spleenwort is a miniature marvel for well-drained shade.