Does it need full sun?

No, it prefers partial to full shade.

How often should I water it?

Keep the soil consistently moist but not waterlogged.

Plant guide

Western sword fern.

Polystichum munitum

Pronounced po-LIS-ti-kum myoo-NEE-tum

Also known as Pacific sword fern, Western Sword-Fern, Western Swordfern, common sword fern, pineland sword fern, sword fern, western sword fern

The Western sword fern is a classic evergreen beauty that brings a lush, woodland feel to any shady garden. It is a sturdy plant that stays green all year round. You will love how its elegant fronds add texture to your landscape.

At a glance

Care level: Easy
Plant type: Fern
Light: Partial shade to full shade
Indoor light: Medium light
Water: Every 3 to 7 days
Mature size: 3 to 4 feet
Growth rate: Medium
Hardiness: USDA 5 to 9
Bloom time: None, this is a spore bearing fern.

Care

Keep the soil consistently moist but never soggy to prevent root rot. Watch for browning tips which often signal the air is too dry. It thrives best when protected from harsh afternoon sun.

Watering: Water whenever the top inch of soil feels dry to the touch.
Feeding: Apply a balanced liquid fertilizer during the active growing season.
Pruning: Trim away old or damaged fronds in late winter before new growth appears.
Repotting: Move to a slightly larger container once the roots have filled the current pot.
Soil: Rich, well draining, organic soil
Soil pH: 6.0 to 7.0
Temperature: -25 to 35°C
Humidity: 40 to 80%
Drought tolerance: Moderate
Lifespan: Perennial, can live for decades.
Deer and rabbits: High

Signs it needs repotting

roots growing out of the drainage holes
water running straight through the pot
stunted growth

Safety

People: There is no evidence of toxicity in humans, but it is not a food plant.
Children: The fronds are tough and can have sharp edges, so keep them away from small children who might grab them.
Contact allergens: The spores can cause mild skin irritation in sensitive individuals.
Airborne allergens: The fine spores released in late summer may trigger mild respiratory discomfort in those with severe allergies.
Edibility: This plant is not considered edible and should not be consumed.

How to identify it

Dark green leathery fronds
Sword shaped leaflets with serrated edges
Distinctive thumb shaped lobe at base
Circular brown spore clusters underneath

Height: 0.6 to 1.2m
Spread: 0.6 to 1.2m
Leaves: dark green, evergreen
Flowers: 0cm

Problems to watch for

Slugs and SnailsCommon
Tip BurnCommon
Root RotUncommon
Scale InsectsUncommon

By symptom

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Growing it

Propagation: division, spores
When to plant: spring, fall
Overwintering: Leave the old fronds on until late winter to protect the crown, then trim them back just before new growth appears in spring.
In containers: It grows well in large containers, at least 40 centimeters in diameter, provided the soil stays moist.

Division

1. Dig up a mature clump in early spring.
2. Carefully pull or cut the root mass into smaller sections.
3. Replant immediately in moist, rich soil.

Plant in groups of three or five for a natural woodland aesthetic.

Grows well with

Salal · They share similar woodland habitat requirements.
Bleeding Heart · They provide a nice contrast in texture and foliage color.

Similar species

Christmas Fern · It is the eastern North American counterpart to this species.

Science

Family: Dryopteridaceae
Genus: Polystichum
Order: Polypodiales
Class: Polypodiopsida
Native range: Western North America from Alaska to California.
Conservation: This species is abundant and not of conservation concern.

It thrives in the understory of coniferous forests where it captures filtered light and benefits from high organic matter.

Value to wildlife: provides cover for small mammals, nesting material for birds
Uses: woodland gardens, erosion control, foundation planting

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 5/9
Light: 3/9
Temperature: 5/9
Moisture: 6/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: No, it prefers partial to full shade.
How often should I water it?: Keep the soil consistently moist but not waterlogged.

Where the name comes from

Polystichum comes from Greek words for many rows, referring to the spore clusters, while munitum means armed or fortified.

Good to know

Indigenous peoples used the fronds for lining cooking pits.
The common name comes from the sword shaped leaflets.
It remains green throughout the winter in most climates.
It is one of the most recognizable ferns in the western United States.

Also in

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.