Walking Fern (Asplenium rhizophyllum): Unique Fern That "Walks" Across Rocks

Overview

Walking fern (Asplenium rhizophyllum) is a remarkable, evergreen fern native to eastern North America. Its **simple, undivided, heart-shaped to lanceolate fronds** (2–12 inches) taper to a long, slender tip that **roots when it touches moist soil or moss**, forming a new plantlet. Over time, the fern literally "walks" across rock faces, logs, and mossy banks, creating chains of connected plants. A botanical wonder of vegetative propagation.

Walking Mechanism

• Tip Rooting: Frond apex develops roots and a new crown on contact.
• Clonal Spread: Forms spreading mats of genetically identical plants.
• Habitat Specialist: Requires moist, shaded limestone or sandstone.

Culture

Full to partial shade; constantly moist, mossy, alkaline substrate (limestone ideal). **Do not bury rhizomes**—they grow on the surface. Difficult in cultivation; best appreciated in situ or in specialized rock garden troughs. Hardy USDA zones 4–9.

Taxonomic Profile

A botanical curiosity that truly walks, this fern turns rock gardens into living pathways.