American Royal Fern
American Royal Fern
A Stately Native Fern for Minnesota's Wet, Shady Spots
American Royal Fern (Osmunda regalis) is one of the most majestic ferns you can grow — tall, vase-shaped clumps of distinctive, almost shrub-like fronds that rise 3 to 5 feet over a season. A Minnesota native of swamps and stream banks, it turns soggy, shaded problem areas into a lush focal point. Few plants handle wet feet and deep shade as gracefully, making it perfect for rain gardens and pond edges in Woodbury, Maple Grove, and Shoreview.
American Royal Fern Plant Details
| Attribute | Detail |
|---|---|
| Botanical Name | Osmunda regalis var. spectabilis |
| Mature Size | 3–5 ft. tall, 2–4 ft. wide |
| Hardiness Zone | 3–9 (Twin Cities is zone 4b–5a — fully hardy) |
| Light | Part shade to full shade |
| Soil | Moist to wet, rich, acidic soil; thrives in standing-wet sites |
| Winter Hardiness | Reliable to -30°F; dies back and returns each spring |
| Deer Resistance | Rarely browsed by deer or rabbits |
| Native Status | Minnesota native |
| Foliage | Deciduous; bold, leathery fronds with golden fall tones |
Landscape Uses in Minnesota
Rain gardens and wet shade: One of the best ferns for soggy ground — plant it where water collects, along downspout outflows, or at a pond edge. It tolerates standing water that would rot most perennials.
Native and woodland gardens: Its architectural form anchors a shaded native planting. Pair with sensitive fern, ostrich fern, and native sedges.
Best Time to Plant in Minnesota
Plant in spring (late April–May) or early fall (late August–mid September) into moist, shaded soil. Keep it wet through establishment — this fern never wants to dry out.
How to Plant American Royal Fern
Dig a hole twice the width of the root ball at the same depth. Mix in compost or peat to enrich and acidify heavy clay. Set the crown level, backfill, water heavily, and mulch with shredded leaves or bark to lock in moisture. Space 2–3 feet apart.
Watering American Royal Fern
First year: Keep the soil constantly moist to wet — water every 1–2 days in dry weather. It will not tolerate drying out.
After year one: Continue to provide steady moisture; in a naturally wet site, rainfall may suffice. This is not a fern for dry shade.
Q: Will it grow in standing water?
Yes — it's one of the few ferns that tolerates consistently wet, even boggy soil, which makes it ideal for rain gardens and pond edges.
Q: Is it native to Minnesota?
Yes — royal fern is native to Minnesota wetlands and woodlands, supporting local ecosystems.
Q: Is it deer-resistant?
Yes — deer and rabbits rarely browse ferns.
Q: Will it survive a Minnesota winter?
Easily — hardy to zone 3, it dies back in fall and returns each spring.
You May Also Like
Sensitive Fern (Onoclea sensibilis): A spreading native fern for the same wet shade.
Ostrich Fern (Matteuccia struthiopteris): A tall native fern with edible spring fiddleheads.
Lady Fern (Athyrium filix-femina): A graceful native fern for moist woodland beds.