Woolgrass Plant Care
Scirpus cyperinus (L.) Kunth
Updated · Sources · How we source care data
Scirpus cyperinus, commonly known as woolgrass, is an emergent wetland herb that is native to the eastern United States and eastern Canada. Other common names include cottongrass bulrush and brown woolly sedge.
Every 3–7 days
Full sun to part shade
50–85°F
40–70%
At a glance
How do you care for Woolgrass?
Water Woolgrass every 3–7 days, letting the top layer of soil dry out between waterings, and give it full sun to part shade. It prefers temperatures of 50–85°F (10–29°C) and 40–70% humidity.
Where Is the Woolgrass Native To?
What Is the Woolgrass?
Woolgrass (Scirpus cyperinus) belongs to the Cyperaceae family within the Scirpus genus. Woolgrass is native to the eastern United States and eastern Canada. Woolgrass is also known as American Bulrush, Tawny Bulrush, Brown Woolgrass.
Woolgrass displays a grass-like clumping growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Woolgrass produces inconspicuous small brown or green flowers in clusters.
Leaf size: approximately 12 inches.
How Often Should You Water a Woolgrass?
Scirpus cyperinus requires watering every 3–7 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 3–7 days
Let soil partially dry between waterings
What Light Does the Woolgrass Need?
Woolgrass thrives in full sun to part shade.
Light Requirement
Full sun to part shade
What Temperature and Humidity Does the Woolgrass Prefer?
Scirpus cyperinus grows best at temperatures of 50–85°F. Woolgrass prefers humidity levels of 40–70%.
Temperature
50–85°F
Humidity
40–70%
What Soil Mix Works Best for a Woolgrass?
Moist, fertile soil with good drainage. Good drainage is essential for Woolgrass to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Woolgrass?
Divide and repot every 2-3 years in early 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 Woolgrass?
Woolgrass can be propagated through division, seeds. Similar propagation techniques also apply to barbed bulrush plant care, which shares the same genus.
Is the Woolgrass Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Woolgrass, 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 Woolgrass?
Woolgrass is susceptible to aphids, leafhoppers, grasshoppers. 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 Woolgrass Need?
Woolgrass grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Woolgrass is native to the eastern United States and eastern Canada. In cooler regions, grow Woolgrass as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Woolgrass 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 Scirpus genus — compare its care with other Scirpus species on PlantoScan.
Scirpus is part of the Cyperaceae plant family — browse all Cyperaceae genera and species.
Woolgrass thrives in bright light and direct sun — see other bright-light plants.
More Scirpus Species
Other Scirpus species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Scirpus cyperinus (L.) Kunth, family Cyperaceae (first published in Enum. Pl. [Kunth] 2: 170. 1837 [1-6 May 1837]) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Woolgrass, 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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