Japanese tassel fern

Sun

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

Water

Keep evenly moist, especially during establishment and dry weather, but never waterlogged.

Soil

Humus-rich, well-drained soil; slightly acidic to neutral conditions are ideal, though it tolerates some alkalinity.

Height

2-3 ft (0.6-0.9 m)

Spread

2-3 ft (0.6-0.9 m)

Foliage

Evergreen. Glossy, dark green, finely divided fronds with bristly scales on the stalks; new growth is lighter green and briefly droops at the tips.

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

Mildly toxic: may upset a stomach

Growth rate

Slow

• Plant with the crown at soil level, not buried beneath soil or mulch.
• Water deeply when the soil surface begins to dry; give extra attention during the first growing season.
• Apply leaf mould or well-rotted compost around the clump each spring, keeping the crown clear.
• Avoid heavy feeding; a light application of balanced slow-release fertiliser in spring is enough if growth is weak.
• Shelter from drying winds and hot afternoon sun.

Pruning. In late winter or early spring, cut damaged or tired fronds close to the base before new growth unfurls. Leave healthy green fronds unless they obstruct the emerging growth, and avoid cutting the new curled shoots.

Late winter

Remove winter-damaged fronds before the new curled shoots emerge.

Spring

Plant new ferns, water thoroughly, and mulch around rather than over the crown.

Late spring

Check tender new growth for slug and snail damage, and hand-pick pests where needed.

Summer

Water during dry spells and check that strong sun is not scorching the fronds.

Autumn

Top up leaf mould where needed, keeping wet leaves and mulch out of the crown.

Winter

Leave healthy evergreen fronds in place and check that water drains freely around the plant.

• Repeat clumps along a shaded path for a consistent evergreen edge.
• Plant beneath deciduous trees with hellebores and epimediums, allowing for competition from tree roots.
• Pair with broad-leaved hostas or bergenias to contrast leaf shapes.
• Use beside shaded rocks or stone steps in Japanese-inspired gardens.
• Grow in a large, well-drained container in a sheltered shady courtyard.

Garden styles it suits: Woodland, Japanese, Green on green, Secret garden, Modern courtyard and Winter interest.

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

Wildlife: Dense fronds and nearby leaf litter provide shelter for small invertebrates. It produces spores rather than flowers, so it does not supply nectar or pollen.

• Slugs and snails can chew emerging fronds; hand-pick them and, if necessary, use an iron-phosphate bait according to its label.
• Brown, crisp frond edges usually indicate dry soil, drying wind or excessive sun; water deeply and improve shade or shelter.
• Crown or root rot can develop in waterlogged soil; improve drainage and keep the crown above standing water and heavy mulch.
• Winter cold can brown exposed fronds; leave them until late winter, then remove damaged growth before new shoots emerge.

Not known to be toxic to cats, dogs, horses or people; no part is recognised as poisonous. It is an ornamental fern, not an edible plant, and eating it may still cause stomach upset.

• Soft shield fern (Polystichum setiferum)

  Usually has softer, more feathery, less glossy fronds; Japanese tassel fern has firmer, shinier foliage and conspicuously backward-drooping tips during emergence.

• Western sword fern (Polystichum munitum)

  Its long fronds are divided once into narrow leaflets; Japanese tassel fern has leaflets divided again, giving a more intricate texture.

• Holly fern (Cyrtomium falcatum)

  Has broad, sickle-shaped, holly-like leaflets rather than the finely divided leaflets of Japanese tassel fern.

The common name refers to the tassel-like droop of the emerging frond tips, while polyblepharum means 'many eyelashes', referring to its bristly scales.

Propagation. Propagate from spores, which requires patience and clean, consistently humid conditions. Large, established clumps with several crowns can be divided carefully in spring, but single-crowned plants should be left intact.

Accepted botanical name

Polystichum luctuosum Polystichum polyblepharum is an older name for Polystichum luctuosum.

Native range

Cape Provinces, China North-Central, China South-Central, China Southeast, East Himalaya, Free State, Japan, Korea, KwaZulu-Natal, Lesotho, Madagascar and Manchuria.

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