Photo: John BrewCC BY 4.0via PlantoScanresized / cropped
Lemmon's Sword Fern Plant Care
Polystichum lemmonii Underw.
Updated · Sources · How we source care data
Polystichum lemmonii is a species of fern known by the common names Lemmon's holly fern and Shasta fern. It is native to western North America from the Sierra Nevada of California north to Washington.
Every 7–14 days
Filtered light, partial shade
60–75°F
50–70%
At a glance
How do you care for Lemmon's Sword Fern?
Water Lemmon'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 Lemmon's Sword Fern Native To?
What Is the Lemmon's Sword Fern?
Lemmon's Sword Fern (Polystichum lemmonii) belongs to the Dryopteridaceae family within the Polystichum genus. Lemmon's Sword Fern is native to western North America from the Sierra Nevada of California north to Washington.
Lemmon's Sword Fern displays a clumping fern growth habit, reaching up to 2 ft tall with a spread of approximately 2 ft. Lemmon's Sword Fern produces non-flowering.
Leaf size: approximately 18 inches.
How Often Should You Water a Lemmon's Sword Fern?
Polystichum lemmonii 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 Lemmon's Sword Fern Need?
Lemmon's Sword Fern thrives in filtered light, partial shade. Avoid placing Lemmon'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 Lemmon's Sword Fern Prefer?
Polystichum lemmonii grows best at temperatures of 60–75°F. Lemmon'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 Lemmon's Sword Fern?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Lemmon's Sword Fern to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Lemmon's Sword Fern?
Feed Lemmon'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 Lemmon'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 Lemmon's Sword Fern?
Lemmon'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 Lemmon's Sword Fern Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Lemmon'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 Lemmon's Sword Fern?
Lemmon'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 Lemmon's Sword Fern Need?
Lemmon's Sword Fern grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Lemmon's Sword Fern is native to western North America from the Sierra Nevada of California north to Washington. In cooler regions, grow Lemmon's Sword Fern as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Lemmon'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.
Lemmon'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 lemmonii Underw., family Dryopteridaceae (first published in Native Ferns, ed. 6 116. 1900) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Lemmon'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.
- Photo: John Brew, CC BY 4.0, PlantoScan — original.
- 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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