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American Royal Fern

Osmunda spectabilis

Also listed as Osmunda mexicana, Osmunda palmeri

Also known as Royal Fern, Regal Fern, Flowering Fern

herbaceousβ›… part shadeπŸ’§πŸ’§πŸ’§ high water❄ Hardy: Zone 3a – Zone 8b

Climate Match for your location

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A deciduous fern with large, feathery fronds that emerge in spring with a striking reddish-bronze color before maturing to green. It thrives in moist woodland settings and prefers consistently wet soil.

Why grow it

Osmunda spectabilis distinguishes itself among native ferns by combining reliable hardiness with notably large, upright fronds that can reach 3-4 feet in favorable conditions. Unlike many fern species, it tolerates consistently wet soils and even periodic inundation, making it well-suited to rain gardens, stream margins, and poorly drained woodland sites where other ornamental ferns struggle. The spring emergence of reddish-bronze crosiers offers seasonal visual interest before the mature green canopy develops.

Watch out for

This fern requires sustained soil moisture throughout the growing season and may decline noticeably during extended dry periods, even with supplemental watering. Established plants can take several years to reach full size, so patience is necessary when establishing new plantings. The fronds are brittle and easily damaged by foot traffic or heavy handling, so site placement away from high-traffic areas will yield better results.

Overview

Form
Upright
Growth Rate
moderate
Size
2–5β€² tall Γ— 2–4β€² wide
Dormancy
deciduous
Family
Osmundaceae
Biomass and mulch

Native to the United States

Native Range

Eastern North America

Native to: Alabama, Arkansas, Connecticut, District of Columbia, Delaware, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, North Carolina, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Virginia, Vermont, Wisconsin, West Virginia

Seasonality

Season of Interest

SpringSummer

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Companion Planting

Plants well with