Photo: amantedarmaninCC BY 4.0via iNaturalistresized / cropped
Key Tree-opuntia Plant Care
Pilosocereus robinii (Lem.) Byles & G.D.Rowley
Updated · Sources · How we source care data
Native to Brazil, this plant's most distinctive visual feature is its dense covering of long, white hairs that give it a fuzzy appearance. Pilosocereus robinii is desired by plant collectors for its unique texture and exotic, desert-like aesthetic that adds a touch of whimsy to any collection.
Every 14–21 days
Full sun
50–90°F
10–40%
At a glance
How do you care for Key Tree-opuntia?
Water Key Tree-opuntia every 14–21 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 50–90°F (10–32°C) and 10–40% humidity. Fertilize it every 8 months during the growing season.
Where Is the Key Tree-opuntia Native To?
What Is the Key Tree-opuntia?
Key Tree-opuntia (Pilosocereus robinii) belongs to the Cactaceae family within the Pilosocereus genus. Key Tree-opuntia is native to the Florida Keys in the United States, northwestern Cuba, and the north of The Bahamas. Key Tree-opuntia is also known as Key West Pillow Cactus, Key West Cactus.
Key Tree-opuntia displays a tall columnar cactus growth habit, reaching up to 10 ft tall with a spread of approximately 2 ft. Key Tree-opuntia produces large white nocturnal blooms.
How Often Should You Water a Key Tree-opuntia?
Pilosocereus robinii requires watering every 14–21 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 14–21 days
Let soil partially dry between waterings
What Light Does the Key Tree-opuntia Need?
Key Tree-opuntia thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Key Tree-opuntia Prefer?
Pilosocereus robinii grows best at temperatures of 50–90°F. Key Tree-opuntia prefers humidity levels of 10–40%.
Temperature
50–90°F
Humidity
10–40%
What Soil Mix Works Best for a Key Tree-opuntia?
Sandy, well-draining cactus mix with perlite and coarse sand. Good drainage is essential for Key Tree-opuntia to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Key Tree-opuntia?
Feed Key Tree-opuntia every 8 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 8 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 Key Tree-opuntia?
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 Key Tree-opuntia?
Key Tree-opuntia can be propagated through stem cuttings, seeds. Similar propagation techniques also apply to jamaican cereus plant care, which shares the same genus.
Is the Key Tree-opuntia Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Key Tree-opuntia, 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 Key Tree-opuntia?
Key Tree-opuntia is susceptible to spider mites, scale insects. 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 Key Tree-opuntia Need?
Key Tree-opuntia grows outdoors in USDA Zone 10b – 11b. It survives winters down to planting zone 10b. Key Tree-opuntia is native to the Florida Keys in the United States, northwestern Cuba, and the north of The Bahamas. In cooler regions, grow Key Tree-opuntia as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 10b – 11b
Keep exploring plants
Key Tree-opuntia 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 Pilosocereus genus — compare its care with other Pilosocereus species on PlantoScan.
Pilosocereus is part of the Cactaceae plant family — browse all Cactaceae genera and species.
Key Tree-opuntia thrives in bright light and direct sun — see other bright-light plants.
More Pilosocereus Species
Other Pilosocereus species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Pilosocereus robinii (Lem.) Byles & G.D.Rowley, family Cactaceae (first published in in Cact. Succ. J. Gr. Brit. 19(3): 67. 1957.) — World Flora Online record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Key Tree-opuntia, 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: amantedarmanin, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 10b – 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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