Hard shield fern

Sun

Partial to full shade; tolerates some morning sun if the soil stays moist. Avoid hot afternoon sun.

Water

Keep evenly moist while establishing. Once established, water during prolonged dry spells, especially beneath trees.

Soil

Humus-rich, moist but well-drained soil. Tolerates a range of pH levels, including alkaline soil, but not stagnant, waterlogged conditions.

Height

2-3 ft (0.6-0.9 m)

Spread

2-3 ft (0.6-0.9 m)

Foliage

Evergreen. Arching, lance-shaped, twice-divided fronds with leathery, glossy dark green leaflets and bristle-tipped teeth. Young fronds unfurl from a crown covered with brown scales.

Growth

Slow to moderate

Care needed

Low

• Deer resistant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.4 ft (0.42 m)

3. After 2 years

   1.7 ft (0.53 m)

4. After 3 years

   2.1 ft (0.65 m)

5. After 5 years

   2.5 ft (0.75 m)

   full size

About 4 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the UK

Growth rate

Slow

• Plant with the crown at soil level, not buried beneath soil or mulch.
• Water regularly through the first growing season and during extended drought.
• Apply leaf mould or garden compost around the plant each spring, keeping the crown clear.
• Avoid heavy feeding; an annual organic mulch is usually enough.
• Choose a site sheltered from drying winds, which can scorch the fronds.

Pruning. In late winter or early spring, cut damaged and exhausted fronds off near their bases before new fronds unfurl. Leave healthy evergreen fronds in place and avoid cutting the emerging curled shoots.

Late winter

Remove badly weathered fronds before new growth begins.

Spring

Plant new specimens and mulch around established clumps with leaf mould or compost.

Late spring

Check that emerging fronds have room to unfurl and watch for slug damage.

Summer

Water during dry spells, particularly where tree roots compete for moisture.

Autumn

Plant while the soil is moist and still warm, allowing time for roots to establish before freezing weather.

Winter

Leave sound fronds for structure and shelter; check that water is not collecting around the crown.

• Repeat clumps along a shaded path to create a consistent evergreen edge.
• Plant beneath deciduous trees with spring bulbs, allowing fern fronds to cover fading bulb foliage.
• Combine with hostas and hellebores for contrasting leaf shapes in a shaded border.
• Use beside mossy stones or shaded walls where the arching fronds soften hard edges.

Garden styles it suits: Woodland, English country, Japanese, Green on green, Winter interest and Low-maintenance.

Plant it with: Hostas, Hellebores, Epimediums, Snowdrops, Siberian bugloss and Japanese forest grass.

Wildlife: Dense fronds and accumulated leaf litter provide shelter for small invertebrates and other garden animals. As a fern, it produces neither flowers nor nectar.

• Brown, crisp frond edges usually indicate drought, drying wind or strong sun; water deeply and provide more shelter or shade.
• Crown or root rot can develop in waterlogged soil; improve drainage and keep soil and mulch off the crown.
• Slugs and snails may damage unfolding fronds; check after dark, remove them by hand and use wildlife-conscious controls if needed.
• Winter cold and wind may flatten or brown older fronds; leave the crown undisturbed and trim damaged foliage before spring growth.

Not known to be toxic to cats, dogs, horses or people. It is not an edible fern; do not harvest its fronds or young shoots for food.

• Soft shield fern (Polystichum setiferum)

  Its fronds are softer, usually less glossy and more feathery. The small leaflets generally have clearer little stalks, whereas those of hard shield fern are attached more directly.

• Holly fern (Polystichum lonchitis)

  It has narrower, once-divided fronds with undivided, holly-like leaflets; hard shield fern has broader fronds whose main divisions are divided again.

Polystichum means 'many rows', referring to the rows of spore-bearing structures beneath the fronds, and aculeatum means 'prickly', referring to the pointed leaflet teeth.

Propagation. Propagate from ripe spores, allowing several years to produce substantial plants. Large, established plants with separate crowns can sometimes be divided in spring, but single-crowned plants should not be split.

Accepted botanical name

Polystichum aculeatum

Native range

Albania, Algeria, Altay, Austria, Baltic States, Belgium, Bulgaria, Canary Is., Corse, Czechoslovakia, Denmark and France.

Measured

Soil pH 6.5 to 7. Average height 78 cm.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.