Japanese painted fern

Sun

Partial to full shade; gentle morning sun is suitable where the soil stays moist. Avoid hot afternoon sun.

Water

Keep the root zone evenly moist but not waterlogged. Water during dry spells, especially in the first growing season and in containers.

Soil

Humus-rich, moisture-retentive soil with good drainage; slightly acidic to neutral soil is ideal, though it tolerates a wider pH range.

Height

1-1.5 ft (0.3-0.45 m)

Spread

1.5-2 ft (0.45-0.6 m)

Foliage

Soft, finely divided, arching fronds. Painted forms have silver-grey and green blades with burgundy-purple midribs and stems; colour varies with the form, light and season.

Growth

Slow to moderate, gradually forming a broader clump.

Care needed

Low

• Water at soil level when the surface begins to dry; do not let the root ball dry out completely.
• Apply leaf mould or compost around the clump each spring, keeping it clear of the crown.
• Use a light application of balanced fertiliser in spring only if growth is weak or the soil is poor.
• Divide crowded clumps in early spring, retaining several growing points on each division.
• Shelter the fronds from drying winds and strong afternoon sun.

Pruning. Remove dead fronds in late winter or early spring before the new curled shoots emerge. Cut old stems near ground level without damaging the crown or new growth.

Late winter

Cut away dead fronds before new growth starts.

Early spring

Plant or divide clumps as growth resumes, then water thoroughly.

Spring

Top-dress with compost or leaf mould and check emerging fronds for slug damage.

Summer

Water during dry spells and check that nearby tree roots are not leaving the soil too dry.

Autumn

Allow the fronds to die back naturally and mark the clump so you do not disturb it while dormant.

• Edge a shaded path with repeated clumps to bring pale foliage close to eye level.
• Plant beneath deciduous shrubs with hostas and barrenwort for contrasting leaf shapes.
• Combine painted forms with dark-leaved coral bells to echo their purple stems.
• Use in a shaded container with moisture-loving foliage plants, allowing room for its spreading clump.
• Plant beside a pond or stream in moist, drained ground, not in standing water.

Garden styles it suits: Woodland, Japanese, Cottage garden, Blues and silvers, Secret garden and Small-space.

Plant it with: Hostas, Barrenwort, Coral bells, Siberian bugloss, Astilbes and Japanese forest grass.

Wildlife: The foliage and surrounding leaf litter provide shelter for small invertebrates. It produces spores rather than flowers, so it supplies no nectar or pollen.

• Slugs and snails can damage emerging fronds; inspect at dusk, remove pests and use an appropriate iron-phosphate bait if needed.
• Brown, crisp fronds usually indicate dry soil, hot sun or drying wind; water deeply, mulch and provide more shelter.
• Crown or root rot can develop in waterlogged soil; improve drainage and avoid burying the crown.
• Late frost can blacken newly emerged fronds; protect shoots with horticultural fleece when frost is forecast and remove damaged growth once the risk has passed.

Not known to be toxic to cats, dogs, horses or people. No part is recognised as a significant poisoning hazard, but it is not an edible fern; discourage chewing or eating the fronds and rhizomes.

• Lady fern (Athyrium filix-femina)

  Usually taller and more upright, with predominantly green fronds rather than the low, silver-and-purple foliage of painted forms.

• Eared lady fern (Athyrium otophorum)

  Typically has pale green mature fronds, reddish stems and coppery young growth, without the broad silver-grey colouring of Japanese painted fern.

The species name niponicum means 'Japanese', while 'painted fern' refers to the silver, green and purple markings of its commonly grown forms.

Propagation. Divide established clumps in early spring, keeping roots and several growing points on each piece. It can also be raised from spores, but offspring may not retain the colouring of named selections.

Accepted botanical name

Anisocampium niponicum Athyrium niponicum is an older name for Anisocampium niponicum.

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