Old Man of the Andes Plant Care
Oreocereus trollii (Kupper) Backeb.
Updated · Sources · How we source care data
Oreocereus trollii, commonly known as the Old Man of the Andes cactus, is a species of cacti native to Argentina and Bolivia. Though listed as Least Concern by the IUCN, the plant is collected extensively, and in some areas is threatened.
Every 14–21 days
Full sun
50–85°F
10–40%
At a glance
How do you care for Old Man of the Andes?
Water Old Man of the Andes every 14–21 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 50–85°F (10–29°C) and 10–40% humidity. Fertilize it every 8 months during the growing season.
What Is the Old Man of the Andes?
Old Man of the Andes (Oreocereus trollii) belongs to the Cactaceae family within the Oreocereus genus. Old Man of the Andes is native to Argentina and Bolivia. Old Man of the Andes is also known as Peruvian Torch.
Old Man of the Andes displays a columnar, branching cactus growth habit, reaching up to 6 ft tall with a spread of approximately 2 ft. Old Man of the Andes produces large white nocturnal blooms.
How Often Should You Water a Old Man of the Andes?
Oreocereus trollii 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 Old Man of the Andes Need?
Old Man of the Andes thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Old Man of the Andes Prefer?
Oreocereus trollii grows best at temperatures of 50–85°F. Old Man of the Andes prefers humidity levels of 10–40%.
Temperature
50–85°F
Humidity
10–40%
What Soil Mix Works Best for a Old Man of the Andes?
Sandy, well-draining cactus mix with perlite and coarse sand. Good drainage is essential for Old Man of the Andes to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Old Man of the Andes?
Feed Old Man of the Andes 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 Old Man of the Andes?
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 Old Man of the Andes?
Old Man of the Andes can be propagated through seeds, offsets. Similar propagation techniques also apply to peruvian old-man cactus plant care, which shares the same genus.
Is the Old Man of the Andes Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Old Man of the Andes, 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 Old Man of the Andes?
Old Man of the Andes is susceptible to mealybugs, spider mites. 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 Old Man of the Andes Need?
Old Man of the Andes grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Old Man of the Andes is native to Argentina and Bolivia. In cooler regions, grow Old Man of the Andes as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Old Man of the Andes 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 Oreocereus genus — compare its care with other Oreocereus species on PlantoScan.
Oreocereus is part of the Cactaceae plant family — browse all Cactaceae genera and species.
Old Man of the Andes thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Oreocereus trollii (Kupper) Backeb., family Cactaceae (first published in in Monatsschr. Deutsch. Kakteen-Ges. 1: 96. 1929.) — World Flora Online record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Old Man of the Andes, 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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