Western Sword Fern Plant Care
Polystichum munitum (Kaulf.) C.Presl
Polystichum munitum, the western swordfern, is an evergreen perennial fern native to western North America, where it is one of the most abundant ferns in forested areas. It occurs along the Pacific coast from southeastern Alaska to southern California, and also inland east to southeastern British Columbia, northern Idaho and western Montana, with disjunctive populations in northern British Columbia, Canada; the Black Hills in South Dakota, United States; and Guadalupe Island off of Baja California, Mexico.
Every 7–14 days
Filtered light, partial shade
60–75°F
50–70%
What Is the Western Sword Fern?
Western Sword Fern (Polystichum munitum) belongs to the Dryopteridaceae family within the Polystichum genus. Western Sword Fern is native to western North America. Western Sword Fern is also known as California Sword Fern, Sword Fern.
Western Sword Fern displays a clumping fern growth habit, reaching up to 2 inches tall with a spread of approximately 2 inches. Western Sword Fern produces non-flowering.
Leaf size: approximately 18 inches.
How Often Should You Water a Western Sword Fern?
Polystichum munitum requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Western Sword Fern Need?
Western Sword Fern thrives in filtered light, partial shade light conditions. The optimal light range is 100–500 lux. Avoid placing Western Sword Fern in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Filtered light, partial shade
100–500 lux
What Temperature and Humidity Does the Western Sword Fern Prefer?
Polystichum munitum grows best at temperatures between 60°F and 75°F. Western Sword Fern prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
60–75°F
Humidity
50–70%
What Soil Mix Works Best for a Western Sword Fern?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Western Sword Fern to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Western Sword Fern?
Repot every 2-3 years. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Western Sword Fern?
Western Sword Fern can be propagated through division of rhizomes, spores. Similar propagation techniques also apply to christmas fern plant care, which shares the same genus.
Fertilizing
Every 6 months
During the growing season
Is the Western Sword Fern Toxic to Pets and Children?
Non-Toxic
Non-toxic to humans and pets
What Pests and Diseases Affect the Western Sword Fern?
Western Sword Fern is susceptible to spider mites, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
What USDA Hardiness Zone Does the Western Sword Fern Need?
Western Sword Fern grows outdoors in USDA Zone 3a – 8b. Native to western North America, Western Sword Fern is adapted to warm climates. In cooler regions, grow Western Sword Fern as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 3a – 8b
Keep exploring plants
Western Sword Fern is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Polystichum genus — compare its care with other Polystichum species on PlantoScan.
Western Sword Fern tolerates low-light rooms and shaded spots — browse the full list of low-light plants.
More Polystichum Species
Other Polystichum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
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