Osmunda cinnamomea (Cinnamon Fern)

A genuinely dramatic wetland fern, cinnamon fern's cinnamon-colored fertile fronds stand upright at the center of a lush vase-shaped clump of arching sterile foliage - the source of "osmunda fiber" long used commercially in orchid potting mixes.

Species Overview

Osmunda cinnamomea (also classified as Osmundastrum cinnamomeum), or cinnamon fern, is a bold, deciduous fern native to a wide range spanning eastern North America. It typically grows in clumps 2 to 3 feet tall, forming a dramatic vase-shaped habit, with separate sterile and fertile fronds - the fertile fronds turning a rich cinnamon brown, giving the plant its common name.

Application

• Wetland restoration - swamps, bogs, and moist woodland plantings
• Streambank and slope stabilization - extensive root system controls erosion
• Rain gardens and shaded, consistently damp borders
• Ornamental accent plantings for dramatic vertical structure

Growing Conditions / Specification Data

• Light: Part Shade to Full Shade
• Soil/Moisture Tolerance: Wet to moist, rich, humus-rich, acidic soils; may go dormant if soil dries out
• Plant Type: Fern
• Mature Height: 2-4 ft. (occasionally to 6 ft. with constant moisture)
• Fall Color: Yellow
• Wetland Indicator Status: NI (No Indicator) - see flags
• Native Range: Northeast/Mid-Atlantic (full list)
• Pollinator Value: None significant - a spore-bearing fern with no flowers; reproduces without pollinators.
• Hydrology: Moist-Wet
• Root Depth: Moderate (12-24 in.)
• Salinity Tolerance: Low
• Growth Rate: Moderate
• Drought Tolerance: Low
• Deer Resistance: Yes (Rarely Damaged)
• Flood Tolerance: High - Rated Moist-to-Wet hydrology in a formal stormwater vegetation reference table.
• Shade Tolerance: Tolerant
• Growth Habit: Clumping/Mounding - vase-forming
• USDA Hardiness Zones: 3-9

Planting Guidance

• Slow to establish but long-lived; does not spread rapidly by rhizomes, unlike many large ferns - forms a well-behaved clump rather than a colonizing patch.