Osmunda regalis

Description

Osmunda regalis – royal fern

Botanical name: Osmunda regalis
Common names: Royal fern
Family: Osmundaceae
Plant type: Deciduous fern
Habit: Large, clump-forming, upright
Pot size: 3 litre pot
Eventual size: Approx. 1.5–2m tall × 1.5m spread
Foliage: Large, handsome, bright green divided fronds turning russet in autumn, with distinctive rust-brown fertile fronds; deciduous
Flowers: None — ferns reproduce by spores, not flowers
Scent: Not scented
Aspect / light: Partial shade (tolerates sun if roots stay wet)
Soil: Moist to wet, humus-rich; neutral to acid; dislikes dry soil
Hardiness: RHS H6 (hardy, to about −20°C); USDA zones 3–9
Exposure: Sheltered
Native range: Native to Europe including the UK
Toxicity / pet & child safety: Generally considered non-toxic to people and pets

Osmunda regalis, the royal fern, is a magnificent large fern with bright green fronds turning russet in autumn and distinctive rust-brown fertile fronds. Superb for pond margins, bog gardens and wet, shaded ground.

GardenAdvice notes

A truly regal native fern, Osmunda regalis is one of the largest and most impressive hardy ferns, forming a bold clump of handsome, bright green fronds that turn warm russet in autumn. Its distinctive rust-brown fertile fronds stand above the foliage in summer. It demands moist to wet ground and is unrivalled for a bog garden or waterside.

Growing & planting

Plant in spring or autumn in moist to wet, humus-rich, neutral to acid soil in partial shade — it tolerates more sun than most ferns provided the roots stay wet. Ideal at pond and stream margins and in bog gardens. Work in plenty of leaf mould or compost, and allow room, as it becomes large. Never let it dry out.

Care & maintenance

Low-maintenance. Keep the soil reliably moist, and mulch with leaf mould in autumn. Cut back the old fronds in late autumn or early spring as they die down. No feeding is usually needed beyond an annual mulch.

Propagation

• Division: Lift and divide congested clumps in spring.
• Spores: Can be raised from spores sown on moist, sterile compost, though this is slow and specialised.

Pests & diseases

Generally trouble-free. Its one essential is constant moisture — the fronds scorch and brown badly if the soil dries out. Given wet ground it is robust, long-lived and little troubled by pests.

Uses in the garden

Magnificent at pond and stream margins, in bog gardens and in permanently moist, shaded borders, where it makes a bold specimen and turns fine autumn colour

Wildlife value

The fronds and crown provide cover and shelter for small invertebrates through the year.

Toxicity & safety

Ferns are generally regarded as non-toxic to people and pets, though as with all ornamental plants they are not intended for eating.

GardenAdvice tip

The royal fern is a spectacular plant for wet ground — the one essential is moisture, as it will not tolerate drying out, so save it for a bog garden, pond edge or reliably damp border where it can reach its full, majestic size. It even tolerates more sun than most ferns if its roots stay wet, and rewards you with lovely russet autumn colour.

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