Western Sword Fern
Polystichum munitum
Essentials
At a Glance
Plant Type
Fern
Height
36 inches
Width
48 inches
Light
Partial Sun, Shade
Zones
4, 5, 6, 7, 8, 9
Water
Consistently moist
Humidity
Prefers high humidity
Lifespan
Perennial
Native To
Western North America
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
Polystichum munitum, commonly known as the Western Sword Fern, is a robust, hardy evergreen fern native to western North America. It is characterized by its arching, leathery, dark green fronds that can grow up to 4 feet long. This fern is particularly valued for its ability to thrive in moist, shaded environments and is also known for its resilience in a variety of soil types.
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck spores onto moist, well-draining soil in spring.
- Mist cuttings regularly to maintain humidity and encourage rooting.
- Transplant young ferns when they reach 4 inches tall, usually in early summer.
- Mulch around the base to retain moisture and suppress weeds.
- Fertilize lightly with a balanced, organic fertilizer in spring and summer.
- Divide clumps every 3-4 years in early spring for propagation.
Pro Tip
Keep soil consistently moist and provide partial to full shade for best growth.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist 🌱
- Provide filtered shade to prevent leaf scorch
- Apply organic mulch to conserve moisture
Don't
- Avoid letting soil dry out completely ❌
- Do not expose to direct, hot afternoon sun
- Avoid over-fertilizing which can cause legginess
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Mulch | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Western Sword Fern questions
What zones can Western Sword Fern grow in?
Western Sword Fern is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Western Sword Fern deer resistant?
Yes — Western Sword Fern is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
Does Western Sword Fern need full sun?
Western Sword Fern does best in part shade.
Is Western Sword Fern drought tolerant?
Yes — once established (usually after the first full season), Western Sword Fern handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Polystichum to compare
Christmas Fern
Polystichum acrostichoides
Soft Shield Fern
Polystichum setiferum
Makino's Holly Fern
Polystichum makinoi
Japanese Tassel Fern
Polystichum polyblepharum
Soft Shield Fern
Polystichum setiferum 'Plumosomultilobum'
Hybrid Shield Fern
Polystichum x hybrida
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Grow Western Sword Fern with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
