Pilosocereus millspaughii Plant Care
Pilosocereus millspaughii (Britton) Byles & G.D.Rowley
Updated · Sources · How we source care data
Pilosocereus millspaughii, commonly called the Key Largo tree cactus, is a species of flowering plant in the family Cactaceae, native to The Bahamas, Cuba, Haiti, and the Turks and Caicos Islands. It was also native to Florida, but is now locally extinct there due to sea level rise.
Every 14–21 days
Full sun
50–90°F
10–40%
At a glance
How do you care for Pilosocereus millspaughii?
Water Pilosocereus millspaughii 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 Pilosocereus millspaughii Native To?
What Is the Pilosocereus millspaughii?
Pilosocereus millspaughii (Pilosocereus millspaughii) belongs to the Cactaceae family within the Pilosocereus genus. Pilosocereus millspaughii is native to The Bahamas, Cuba, Haiti, and the Turks and Caicos Islands.
Pilosocereus millspaughii displays a tall columnar cactus growth habit, reaching up to 10 ft tall with a spread of approximately 2 ft. Pilosocereus millspaughii produces large white nocturnal blooms.
How Often Should You Water a Pilosocereus millspaughii?
Pilosocereus millspaughii 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 Pilosocereus millspaughii Need?
Pilosocereus millspaughii thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Pilosocereus millspaughii Prefer?
Pilosocereus millspaughii grows best at temperatures of 50–90°F. Pilosocereus millspaughii prefers humidity levels of 10–40%.
Temperature
50–90°F
Humidity
10–40%
What Soil Mix Works Best for a Pilosocereus millspaughii?
Sandy, well-draining cactus mix with perlite and coarse sand. Good drainage is essential for Pilosocereus millspaughii to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Pilosocereus millspaughii?
Feed Pilosocereus millspaughii 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 Pilosocereus millspaughii?
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 Pilosocereus millspaughii?
Pilosocereus millspaughii can be propagated through stem cuttings, seeds. Similar propagation techniques also apply to jamaican cereus plant care, which shares the same genus.
Is the Pilosocereus millspaughii Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Pilosocereus millspaughii, 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 Pilosocereus millspaughii?
Pilosocereus millspaughii 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 Pilosocereus millspaughii Need?
Pilosocereus millspaughii grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Pilosocereus millspaughii is native to The Bahamas, Cuba, Haiti, and the Turks and Caicos Islands. In cooler regions, grow Pilosocereus millspaughii as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Pilosocereus millspaughii 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.
Pilosocereus millspaughii 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 millspaughii (Britton) 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 Pilosocereus millspaughii, 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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