Polystichum aculeatum

Description

Polystichum aculeatum – hard shield fern

Botanical name: Polystichum aculeatum
Common names: Hard shield fern
Family: Dryopteridaceae
Plant type: Evergreen fern
Habit: Clump-forming, arching shuttlecock
Pot size: 3 litre pot
Eventual size: Approx. 60–90cm tall × 60cm spread
Foliage: Glossy, leathery, dark green fronds, elegantly tapering; evergreen
Flowers: None — ferns reproduce by spores, not flowers
Scent: Not scented
Aspect / light: Partial to full shade
Soil: Moist but well-drained, humus-rich; tolerates lime and drier shade; any pH
Hardiness: RHS H7 (very hardy, below −20°C); USDA zones 5–8
Exposure: Sheltered
Native range: Native to Europe including the UK
Toxicity / pet & child safety: Generally considered non-toxic to people and pets

Polystichum aculeatum, the hard shield fern, is a handsome native evergreen with glossy, leathery, dark green fronds forming elegant tapering shuttlecocks. Tough and lime-tolerant, it is superb for shady and woodland borders.

GardenAdvice notes

A handsome and reliable native evergreen fern, the hard shield fern forms elegant, arching shuttlecocks of glossy, leathery, dark green fronds that taper gracefully at both ends. It is tough, long-lived and more tolerant of lime and drier shade than many ferns, giving excellent year-round structure to a shady border.

Growing & planting

Plant in spring or autumn in moist but well-drained, humus-rich soil in partial to full shade, with shelter from cold, drying winds. Work in leaf mould or compost to hold moisture, and space according to the ultimate size, generally about 45–60cm apart.

Care & maintenance

Low-maintenance. Keep the soil from drying out, especially while establishing, and mulch with leaf mould in autumn. Remove old, tatty or frost-burnt fronds in early spring before the new growth unfurls. 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 and robust. Slugs and snails may graze the soft young fronds as they unfurl in spring, and fronds can scorch in dry or exposed positions. Moist soil and shelter keep it looking its best.

Uses in the garden

Superb for shady and woodland borders, north-facing beds, shaded banks and among other shade plants, where its glossy evergreen shuttlecocks give elegant year-round structure

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 hard shield fern is one of the best native evergreen ferns for reliable year-round structure, its glossy, leathery fronds shrugging off winter and tolerating limy soil and drier shade that fussier ferns dislike. Give it a moist, shaded spot for the lushest growth, and simply remove the old fronds in early spring.

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