Photo: Mel WhitingCC BY 4.0via iNaturalistresized / cropped
Caldwell's Club-rush Plant Care
Bolboschoenus caldwellii (V.J.Cook) Soják
Updated · Sources · How we source care data
This plant's long, slender leaves with a striking blue-green hue make it a standout in any garden. Hailing from North America, its unique appearance and adaptability make it a prized addition for plant collectors looking to add a touch of elegance to their botanical collection.
Every 2–4 days
Full sun to part shade
50–85°F
60–80%
At a glance
How do you care for Caldwell's Club-rush?
Water Caldwell's Club-rush 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 50–85°F (10–29°C) and 60–80% humidity. Fertilize it every month during the growing season.
Where Is the Caldwell's Club-rush Native To?
What Is the Caldwell's Club-rush?
Caldwell's Club-rush (Bolboschoenus caldwellii) belongs to the Cyperaceae family within the Bolboschoenus genus. Caldwell's Club-rush is native to Australia and New Zealand.
Caldwell's Club-rush displays a grass-like perennial growth habit, reaching up to 3 ft tall with a spread of approximately 1 ft. Caldwell's Club-rush produces small, inconspicuous flowers in clusters.
Leaf size: approximately 12 inches.
How Often Should You Water a Caldwell's Club-rush?
Bolboschoenus caldwellii 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 Caldwell's Club-rush Need?
Caldwell's Club-rush thrives in full sun to part shade.
Light Requirement
Full sun to part shade
What Temperature and Humidity Does the Caldwell's Club-rush Prefer?
Bolboschoenus caldwellii grows best at temperatures of 50–85°F. Caldwell's Club-rush prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
50–85°F
Humidity
60–80%
What Soil Mix Works Best for a Caldwell's Club-rush?
Moist, fertile soil with good drainage. Good drainage is essential for Caldwell's Club-rush to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Caldwell's Club-rush?
Feed Caldwell's Club-rush 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 Caldwell's Club-rush?
Divide and 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 Caldwell's Club-rush?
Caldwell's Club-rush can be propagated through division, seeds. Similar propagation techniques also apply to mediterranean bulrush plant care, which shares the same genus.
Is the Caldwell's Club-rush Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Caldwell's Club-rush, 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 Caldwell's Club-rush?
Caldwell's Club-rush is susceptible to aphids, 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 Caldwell's Club-rush Need?
Caldwell's Club-rush grows outdoors in USDA Zone 8a – 11b. It survives winters down to planting zone 8a. Caldwell's Club-rush is native to Australia and New Zealand.
Hardiness Zone
Zone 8a – 11b
Keep exploring plants
Caldwell's Club-rush 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 Bolboschoenus genus — compare its care with other Bolboschoenus species on PlantoScan.
Bolboschoenus is part of the Cyperaceae plant family — browse all Cyperaceae genera and species.
Caldwell's Club-rush thrives in bright light and direct sun — see other bright-light plants.
More Bolboschoenus Species
Other Bolboschoenus species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Bolboschoenus caldwellii (V.J.Cook) Soják, family Cyperaceae (first published in Cas. Nár. Mus., Odd. Prír. 141: 62 (1972)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Caldwell's Club-rush, 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: Mel Whiting, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 8a – 11b, 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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