Osmunda regalis (American Royal Fern)

One of the largest and most distinctive native ferns available, royal fern's coarse, widely-separated leaflets set it apart from every other fern in the catalog - tolerant enough to thrive in full sun given consistently boggy conditions, even growing directly in shallow water.

Species Overview

Osmunda regalis, or royal fern, is one of the largest ferns in non-tropical North America, reaching 5 feet or more in height. Its large, broad fronds are composed of numerous small leaflets that give it a pea-family-like appearance quite unlike most other ferns. The spore-producing inflorescence at the top of fertile fronds resembles a cluster of flowers, earning it the alternate common name "flowering fern."

Application

• Wetland and bog restoration - streambanks, pond margins, damp woodlands
• Water garden and shallow-water plantings
• Dramatic accent plantings in shade or bog gardens
• Naturalized moist-soil colonizing plantings

Growing Conditions / Specification Data

• Light: Full Sun (in bog-like conditions) to Full Shade
• Soil/Moisture Tolerance: Acid, rich, moist to wet soil; highly adaptable, will even thrive in shallow water
• Plant Type: Fern
• Mature Height: 2-4 ft. (occasionally to 6 ft.)
• 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

• A slow spreader; thrives in bogs or wet areas, though growth will be slower and smaller in neutral or alkaline soil compared to acidic conditions.