Photo: Vladimír FukaCC BY 4.0via iNaturalistresized / cropped
Black Bog-sedge Plant Care
Schoenus nigricans L.
Updated · Sources · How we source care data
Schoenus nigricans, also known as black bog-rush, is a distinctive plant with dark-colored, slender leaves that form dense clumps. This plant is native to wetlands and marshy areas in Europe and North America, making it a popular choice for water gardens or rain gardens among plant enthusiasts.
Every 3–5 days
Full sun to part shade
50–75°F
60–80%
At a glance
How do you care for Black Bog-sedge?
Water Black Bog-sedge every 3–5 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. Fertilize it every month during the growing season.
Where Is the Black Bog-sedge Native To?
- Algeria
- Angola
- Australia
- Benin
- Botswana
- Burkina Faso
- Burundi
- Cameroon
- Canada
- Cape Verde
- Central African Republic
- Chad
- Côte d'Ivoire
- Djibouti
- DR Congo
- Egypt
- Equatorial Guinea
- Eritrea
- Eswatini
- Ethiopia
- Gabon
- Ghana
- Guinea
- Guinea-Bissau
- Kenya
- Lesotho
- Liberia
- Libya
- Madagascar
- Malawi
- Mali
- Mauritania
- Mexico
- Morocco
- Mozambique
- Namibia
- Niger
- Nigeria
- Republic of the Congo
- Rwanda
- Sao Tome and Principe
- Senegal
- Sierra Leone
- Somalia
- South Africa
- South Sudan
- Sudan
- Tanzania
- The Gambia
- Togo
- Tunisia
- Uganda
- United States
- Zambia
- Zimbabwe
What Is the Black Bog-sedge?
Black Bog-sedge (Schoenus nigricans) belongs to the Cyperaceae family within the Schoenus genus. Black Bog-sedge is native to Eurasia, parts of Africa, Australia, and southern North America, including Mexico and the southernmost United States. Black Bog-sedge is also known as Black Sedge.
Black Bog-sedge displays a grass-like perennial growth habit, reaching up to 2 ft tall with a spread of approximately 1 ft. Black Bog-sedge produces small inconspicuous flowers in clusters.
Leaf size: approximately 8 inches.
How Often Should You Water a Black Bog-sedge?
Schoenus nigricans 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 Black Bog-sedge Need?
Black Bog-sedge thrives in full sun to part shade.
Light Requirement
Full sun to part shade
What Temperature and Humidity Does the Black Bog-sedge Prefer?
Schoenus nigricans grows best at temperatures of 50–75°F. Black Bog-sedge 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 Black Bog-sedge?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Black Bog-sedge to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Black Bog-sedge?
Feed Black Bog-sedge every month 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 month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Black Bog-sedge?
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 Black Bog-sedge?
Black Bog-sedge can be propagated through division, seeds. Similar propagation techniques also apply to sand bog rush plant care, which shares the same genus.
Is the Black Bog-sedge Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Black Bog-sedge, 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 Black Bog-sedge?
Black Bog-sedge is susceptible to aphids, grasshoppers, leafhoppers. 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 Black Bog-sedge Need?
Black Bog-sedge grows outdoors in USDA Zone 7a – 10b. It survives winters down to planting zone 7a. Black Bog-sedge is native to Eurasia, parts of Africa, Australia, and southern North America, including Mexico and the southernmost United States.
Hardiness Zone
Zone 7a – 10b
Keep exploring plants
Black Bog-sedge 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 Schoenus genus (family Cyperaceae) — search all Schoenus species in the plant lookup.
Black Bog-sedge thrives in bright light and direct sun — see other bright-light plants.
More Schoenus Species
Other Schoenus species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Schoenus nigricans L., family Cyperaceae (first published in Sp. Pl. : 43 (1753)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Black Bog-sedge, 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: Vladimír Fuka, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 7a – 10b, estimated from the plant's typical growing conditions.
- 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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