Rocky Mountain Sword Fern Plant Care
Polystichum scopulinum Maxon
Updated · Sources · How we source care data
This fern's fronds stand out with their glossy, leathery texture and deep green color, originating from the rocky cliffs of western North America. Plant collectors are drawn to Polystichum scopulinum for its unique ability to thrive in challenging conditions with minimal care, making it a sought-after addition to any collection.
Every 7–14 days
Filtered light, partial shade
60–75°F
50–70%
At a glance
How do you care for Rocky Mountain Sword Fern?
Water Rocky Mountain Sword Fern every 7–14 days, letting the top layer of soil dry out between waterings, and give it filtered light, partial shade. It prefers temperatures of 60–75°F (16–24°C) and 50–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Rocky Mountain Sword Fern Native To?
What Is the Rocky Mountain Sword Fern?
Rocky Mountain Sword Fern (Polystichum scopulinum) belongs to the Dryopteridaceae family within the Polystichum genus. Rocky Mountain Sword Fern is native to much of western North America, and. Rocky Mountain Sword Fern is also known as Rocky Mountain Holly Fern.
Rocky Mountain Sword Fern displays a clumping fern growth habit, reaching up to 2 ft tall with a spread of approximately 2 ft. Rocky Mountain Sword Fern produces non-flowering.
Leaf size: approximately 18 inches.
How Often Should You Water a Rocky Mountain Sword Fern?
Polystichum scopulinum 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 Rocky Mountain Sword Fern Need?
Rocky Mountain Sword Fern thrives in filtered light, partial shade. Avoid placing Rocky Mountain Sword Fern in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Filtered light, partial shade
What Temperature and Humidity Does the Rocky Mountain Sword Fern Prefer?
Polystichum scopulinum grows best at temperatures of 60–75°F. Rocky Mountain 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 Rocky Mountain Sword Fern?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Rocky Mountain Sword Fern to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Rocky Mountain Sword Fern?
Feed Rocky Mountain Sword Fern every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Rocky Mountain 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 Rocky Mountain Sword Fern?
Rocky Mountain 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.
Is the Rocky Mountain Sword Fern Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Rocky Mountain Sword Fern, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Rocky Mountain Sword Fern?
Rocky Mountain 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.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Rocky Mountain Sword Fern Need?
Rocky Mountain Sword Fern grows outdoors in USDA Zone 4a – 8b. It survives winters down to planting zone 4a. Rocky Mountain Sword Fern is native to much of western North America, and.
Hardiness Zone
Zone 4a – 8b
Keep exploring plants
Rocky Mountain 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.
Polystichum is part of the Dryopteridaceae plant family — browse all Dryopteridaceae genera and species.
Rocky Mountain Sword Fern produces blooms — browse other flowering plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Polystichum scopulinum Maxon, family Dryopteridaceae (first published in Fern Bull. 8: 29. 1900) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Rocky Mountain Sword Fern, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 4a – 8b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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