How to Grow Sword Fern

Sword Fern

Polystichum munitum

fern

Sword fern is a native Pacific Northwest evergreen fern with distinctive long, leathery fronds that grow in upright clusters, creating a lush, architectural appearance. It thrives in shaded woodland conditions and is highly valued for its ornamental foliage and low-maintenance nature. This hardy fern is popular in shade gardens, native plant landscapes, and indoor container growing.

Growing Conditions

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Sun: Partial to deep shade; 2-4 hours of indirect light daily; dappled sunlight preferred

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Water: Consistently moist but not waterlogged; prefers high humidity (50-70%); water when top inch of soil feels dry; sensitive to drought once established but benefits from regular misting

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Spacing: 18-24 inches between plants inches

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Days to maturity: Not applicable (fern); reaches mature size in 2-3 years

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Planting depth: Crown level; do not bury the crown as it may rot

Soil

Type: Rich, well-draining loamy soil with high organic matter

pH: 5.5-7.0

Amendments:

Peat moss or coconut coir Leaf mold or compost Composted bark Perlite or pumice for drainage

Growing Zones

Find your zone →

Thrives in zones 5-9; best performance in zones 6-8

5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

Growth Stages

Establishment

4-8 weeks

New plants develop 4-8 small fronds clustered around the crown, establishing root system

Keep soil consistently moist; provide shade; mist regularly; avoid transplanting stress by selecting right location first

Vegetative Growth

3-6 months

Fronds elongate and multiply, creating fuller clumps; new fiddleheads (croziers) unfurl continuously

Maintain high humidity; apply balanced fertilizer monthly during growing season; remove dead fronds; mulch around base

Mature Rosette

Ongoing, 2+ years to reach peak size

Plant reaches full size with 20-40+ long, feathery fronds creating dense, upright clumps 2-4 feet tall

Reduce fertilizer frequency; maintain moist conditions; divide if desired; minimal pruning needed

Frond Development

Spring through early fall

Mature fronds develop sori (spore clusters) on undersides; fronds remain evergreen year-round

Do not remove fronds with sori if propagation desired; continue regular watering and humidity maintenance

Companion Planting

Plan your garden →

Plant with:

Hostas Hellebores Coral bells (Heuchera) Astilbe Bleeding heart (Dicentra) Japanese forest grass Lady fern Wood sorrel Foamflower Epimedium

Avoid planting near:

Direct competition from aggressive perennials Dry-loving plants like sedums and ornamental grasses Plants requiring full sun and dry soil

Common Pests

Spray with horticultural oil or insecticidal soap; remove affected fronds; improve air circulation
Isolate plant; spray with neem oil or insecticidal soap; wipe with alcohol-soaked cloth
Increase humidity through misting; spray with water; use miticide if severe; avoid dry conditions
and
Remove by hand; use beer traps; create barriers with diatomaceous earth; reduce moisture if possible

Uses

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Floral Arrangements & Greenery

Household

Sword fern fronds are prized in the floral industry as long-lasting greenery for bouquets, wreaths, and arrangements. The sturdy, elegant fronds can last 1-2 weeks in water, making them ideal for fresh and dried displays. [source]

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Dried Fronds & Botanical Preservation

Craft

Fronds dry beautifully for pressed plant art, herbarium specimens, and botanical crafts. They retain their form and color when properly dried, making them valuable for eco-friendly craft projects. [source]

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Woodland Habitat Creation

Wildlife

Sword ferns provide shelter and nesting material for small woodland creatures, birds, and beneficial insects. Their dense, evergreen foliage creates year-round habitat structure in shade gardens. [source]

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Traditional Indigenous Uses

Medicinal

Pacific Northwest Indigenous peoples traditionally used sword fern fronds for basket weaving and food wrapping. The plant holds cultural and ethnobotanical significance in Native American traditions. [source]

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Low-Maintenance Shade Landscaping

Household

Sword ferns are excellent for creating lush, green shade gardens with minimal maintenance once established. They thrive in difficult-to-plant areas under trees and in woodland settings. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Sword fern is ornamental; harvest fronds for indoor arrangements by cutting at the base when fully mature; fronds last 1-2 weeks in water; propagate via spores collected from sori in summer and early fall, or divide mature clumps in early spring

Fun Facts

🌱 Sword ferns are native to the Pacific Northwest and can live for 10+ years with proper care; some wild populations are centuries old
🌱 The fronds get their name from their sword-like shape and can grow 2-4 feet long, with individual pinnae (leaflets) that resemble tiny sword blades
🌱 Unlike flowering plants, sword ferns reproduce via microscopic spores stored in sori (brown clusters) on the undersides of mature fronds—a single frond can release millions of spores

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