Kruckeberg's Sword Fern Plant Care
Polystichum kruckebergii W.H.Wagner
Updated · Sources · How we source care data
Polystichum kruckebergii is a species of fern known by the common names Kruckeberg's sword fern and Kruckeberg's hollyfern. It is native to western North America from Alaska to Utah to California, where it grows in rocky mountain habitat in subalpine and alpine climates.
Every 7–14 days
Filtered light, partial shade
60–75°F
50–70%
At a glance
How do you care for Kruckeberg's Sword Fern?
Water Kruckeberg's 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 Kruckeberg's Sword Fern Native To?
What Is the Kruckeberg's Sword Fern?
Kruckeberg's Sword Fern (Polystichum kruckebergii) belongs to the Dryopteridaceae family within the Polystichum genus. Kruckeberg's Sword Fern is native to western North America from Alaska to Utah to California.
Kruckeberg's Sword Fern displays a clumping fern growth habit, reaching up to 2 ft tall with a spread of approximately 2 ft. Kruckeberg's Sword Fern produces non-flowering.
Leaf size: approximately 18 inches.
How Often Should You Water a Kruckeberg's Sword Fern?
Polystichum kruckebergii 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 Kruckeberg's Sword Fern Need?
Kruckeberg's Sword Fern thrives in filtered light, partial shade. Avoid placing Kruckeberg's 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 Kruckeberg's Sword Fern Prefer?
Polystichum kruckebergii grows best at temperatures of 60–75°F. Kruckeberg's 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 Kruckeberg's Sword Fern?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Kruckeberg's Sword Fern to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Kruckeberg's Sword Fern?
Feed Kruckeberg's 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 Kruckeberg's 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 Kruckeberg's Sword Fern?
Kruckeberg's 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 Kruckeberg's Sword Fern Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Kruckeberg's 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 Kruckeberg's Sword Fern?
Kruckeberg's 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 Kruckeberg's Sword Fern Need?
Kruckeberg's Sword Fern grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Kruckeberg's Sword Fern is native to western North America from Alaska to Utah to California. In cooler regions, grow Kruckeberg's Sword Fern as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Kruckeberg's 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.
Kruckeberg's Sword Fern produces blooms — browse other flowering plants.
More Polystichum Species
Other Polystichum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Polystichum kruckebergii W.H.Wagner, family Dryopteridaceae (first published in Amer. Fern J. 56(1): 4. 1966 [26 Apr 1966]) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Kruckeberg's 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 13a, calculated from the plant's minimum temperature.
- 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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