Tennessee Ostrich Fern / Glade Fern (Diplazium pycnocarpon): Narrow, Elegant Fern for Rich Woods

Overview

Tennessee ostrich fern (Diplazium pycnocarpon), also called glade fern or narrow-leaved spleenwort, is a graceful, deciduous fern native to rich, moist woodlands of eastern North America. Its **narrow, once-pinnate fronds** (2–3 feet) taper elegantly at both ends, forming a loose, upright clump. Unlike the true ostrich fern (Matteuccia), it does not produce separate fertile fronds; spores are borne on the undersides of the upper pinnae of regular fronds.

Distinguishing Features

• Slender Fronds: Narrower and more delicate than Matteuccia.
• Rich Woods Specialist: Indicator of high-quality, undisturbed forests.
• Clump-Forming: Slowly spreads by short rhizomes; well-behaved.

Culture

Partial to full shade; deep, moist, humus-rich, neutral to slightly alkaline soil. Consistent moisture. Hardy USDA zones 4–8. Excellent for naturalistic woodland gardens.

Taxonomic Profile

For refined, narrow-leaved elegance in the woodland garden, glade fern is a native treasure.