Cotton Grass Plant Care
Eriophorum chamissonis C.A.Mey.
Updated · Sources · How we source care data
Eriophorum chamissonis is a species of flowering plant belonging to the family Cyperaceae.
Every 2–4 days
Full sun to part shade
50–75°F
60–80%
At a glance
How do you care for Cotton Grass?
Water Cotton Grass every 2–4 days, letting the top layer of soil dry out between waterings, and give it full sun to part shade. It prefers temperatures of 50–75°F (10–24°C) and 60–80% humidity.
What Is the Cotton Grass?
Cotton Grass (Eriophorum chamissonis) belongs to the Cyperaceae family within the Eriophorum genus.
Cotton Grass displays a grass-like perennial growth habit, reaching up to 3 ft tall with a spread of approximately 1 ft. Cotton Grass produces small, brown spikelets.
Leaf size: approximately 12 inches.
How Often Should You Water a Cotton Grass?
Eriophorum chamissonis requires watering every 2–4 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 2–4 days
Let soil partially dry between waterings
What Light Does the Cotton Grass Need?
Cotton Grass thrives in full sun to part shade.
Light Requirement
Full sun to part shade
What Temperature and Humidity Does the Cotton Grass Prefer?
Eriophorum chamissonis grows best at temperatures of 50–75°F. Cotton Grass prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
50–75°F
Humidity
60–80%
What Soil Mix Works Best for a Cotton Grass?
Moist, acidic peat or boggy soil. Good drainage is essential for Cotton Grass to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Cotton Grass?
Divide clumps every 3-5 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 Cotton Grass?
Cotton Grass can be propagated through division, seeds.
Is the Cotton Grass Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Cotton Grass, 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 Cotton Grass?
Cotton Grass is susceptible to generally pest-free. 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 Cotton Grass Need?
Cotton Grass grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Cotton Grass as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Cotton Grass 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 Eriophorum genus — compare its care with other Eriophorum species on PlantoScan.
Eriophorum is part of the Cyperaceae plant family — browse all Cyperaceae genera and species.
Cotton Grass thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Eriophorum chamissonis C.A.Mey., family Cyperaceae (first published in Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans 1: 204 (1831)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Cotton Grass, 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 12a, 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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