Marsh Fern Plant Care
Thelypteris palustris Schott
Updated · Sources · How we source care data
Thelypteris palustris, the marsh fern, or eastern marsh fern, is a species of fern native to eastern North America and across Eurasia. It prefers to grow in swamps, bogs, wet fields or thickets, fresh tidal and nontidal marshes, or wooded streambanks.
Every 3–5 days
Filtered light, partial shade
60–75°F
50–70%
At a glance
How do you care for Marsh Fern?
Water Marsh Fern every 3–5 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 Marsh Fern Native To?
What Is the Marsh Fern?
Marsh Fern (Thelypteris palustris) belongs to the Thelypteridaceae family within the Thelypteris genus. Marsh Fern is native to eastern North America and across Eurasia. Marsh Fern is also known as Common Marsh Fern.
Marsh Fern displays a fern with spreading rhizomes growth habit, reaching up to 2 ft tall with a spread of approximately 3 ft. Marsh Fern produces non-flowering fern.
Leaf size: approximately 12 inches.
How Often Should You Water a Marsh Fern?
Thelypteris palustris requires watering every 3–5 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 3–5 days
Let soil partially dry between waterings
What Light Does the Marsh Fern Need?
Marsh Fern thrives in filtered light, partial shade. Avoid placing Marsh 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 Marsh Fern Prefer?
Thelypteris palustris grows best at temperatures of 60–75°F. Marsh 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 Marsh Fern?
Moist, well-draining soil with high organic matter content. Good drainage is essential for Marsh Fern to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Marsh Fern?
Feed Marsh 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 Marsh Fern?
Repot every 1-2 years in spring. 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 Marsh Fern?
Marsh Fern can be propagated through spores, division of rhizomes.
Is the Marsh Fern Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Marsh 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 Marsh Fern?
Marsh Fern is susceptible to aphids, scale insects, spider mites. 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 Marsh Fern Need?
Marsh Fern grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Marsh Fern is native to eastern North America and across Eurasia. In cooler regions, grow Marsh Fern as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Marsh 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 Thelypteris genus — compare its care with other Thelypteris species on PlantoScan.
Thelypteris is part of the Thelypteridaceae plant family — browse all Thelypteridaceae genera and species.
Marsh Fern produces blooms — browse other flowering plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Thelypteris palustris Schott, family Thelypteridaceae (first published in Gen. Fil. [Schott] ad t.10. 1834) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Marsh 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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