Shop ‘Oreocereus trollii – Old Man of the Mountain Cactus’ Care and Growing Guide | Planet Desert

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A person in a gray shirt holds an Old Man of the Mountain Cactus with orange spines and white hair in a black plastic pot with gravel.
Close-up of Oreocereus trollii cactus with long white hair-like spines and some brown spines, with other cacti in the background.
A person in a gray shirt holds an Old Man of the Mountain Cactus (Oreocereus trollii) with white, hair-like fibers and orange spines in gravel.
Small Oreocereus trollii cactus with long, white hair-like fibers and brown spines in rocky soil; blurred cacti in background.
Oreocereus trollii, known as Old Man of the Mountain Cactus, small green columnar cactus with long brown spines and white hair on pebbles.
A small potted Old Man of the Mountain Cactus (Oreocereus trollii) with orange-brown spines and white fibers against a black background.
A small Oreocereus trollii (Old Man of the Mountain) cactus in a pot with long brown spines and white hair, on a plain background.
Oreocereus trollii cactus with white hair-like fibers and brown spines growing in a pot with small rocks against a black background.
Top view of Oreocereus trollii cactus, featuring white, wispy hairs and long brown spines radiating outward on a black background.
Oreocereus trollii cactus with long reddish spines and white hairs in a square black pot with gravel, on a plain light background.
Close-up of an Old Man of the Mountain Cactus ‘Oreocereus trollii’ with orange-brown spines and white hairs in a square gravel-top pot.
A small Oreocereus trollii cactus, with reddish-brown spines and white hair, sits in pebbly soil against a plain white background.
Close-up of Oreocereus trollii cactus with green columnar stem, white hair-like fibers, and long brown spines in a pot with pebbles.
Old Man of the Mountain Cactus ‘Oreocereus trollii’ with white hair-like spines in a pebble-filled pot against a black background.
Close-up of Oreocereus trollii cactus, featuring sharp brown spines and long white hairs over a green surface, on a gray background.
Oreocereus trollii cactus in a pot on gravel, with long reddish spines and white hairs, shown overhead with rocks in the background.
A person in a gray shirt holds an Old Man of the Mountain Cactus with orange spines and white hairs, potted in gravel.
A person in a gray shirt holds an Old Man of the Mountain Cactus with white hair-like fibers and orange spines in gravelly soil.
Close-up of Oreocereus trollii cactus with long white hairs and rust-colored spines, set against a sunlit greenhouse background.
Close-up of the Old Man of the Mountain Cactus ‘Oreocereus trollii’ with reddish-brown spines and white fibers among rocks and gravel.
A person holds an Old Man of the Mountain Cactus (Oreocereus trollii) in a black pot with gravel, orange spines, and white hairs.
Close-up of Old Man of the Mountain Cactus ‘Oreocereus trollii’ with long brown spines and white hair, potted in small rocks.
Close-up of Old Man of the Mountain Cactus ‘Oreocereus trollii’ with brown spines and white hair in a pebble pot, wooden background.
Close-up of an Old Man of the Mountain Cactus ‘Oreocereus trollii’ with white fibers and brown spines in a gravel pot on wood background.
Close-up of the Old Man of the Mountain Cactus ‘Oreocereus trollii’ with brown spines and white fibers in a pot with small rocks.
Oreocereus trollii cactus with white, hair-like spines in a black plastic pot filled with light gravel, set against a red brick wall.
The Old Man of the Mountain Cactus ‘Oreocereus trollii’ in a black plastic pot with pebbles, displayed on a white background.
Old Man of the Mountain Cactus (Oreocereus trollii) with white hairs and brown spines in a black pot with tan pebbles on white background.
Oreocereus trollii, or Old Man of the Mountain Cactus, in a black plastic pot with pebbles, set before a stone background and greenery.
Oreocereus trollii cactus with white hair-like fibers and sharp spines in a black pot with pebbles, set against a beige stone background.
A potted Oreocereus trollii cactus with white, hair-like fibers and long brown spines sits on pebbles before a stone-patterned backdrop.
Close-up of Old Man of the Mountain Cactus ‘Oreocereus trollii’ with long white hairs and brown spines in a pot with small rocks.
Oreocereus trollii, or Old Man of the Mountain Cactus, with long white hairs and spines in gravel against a rustic red brick wall.
Oreocereus trollii cactus with white, woolly spines and brown thorns in a black pot with rocks, shown beside a yellow tape measure.
Close-up of an Oreocereus trollii cactus, known as Old Man of the Mountain, with white hairs and brown spines in tan pebbles on white.
Oreocereus trollii cactus, tall and columnar with white fuzzy spines, in a black plastic pot with pebbles on a plain white background.
A person in a gray shirt holds an Old Man of the Mountain Cactus with orange spines and white hair in a black plastic pot with gravel.
Close-up of Oreocereus trollii cactus with long white hair-like spines and some brown spines, with other cacti in the background.
A person in a gray shirt holds an Old Man of the Mountain Cactus (Oreocereus trollii) with white, hair-like fibers and orange spines in gravel.
Small Oreocereus trollii cactus with long, white hair-like fibers and brown spines in rocky soil; blurred cacti in background.
Oreocereus trollii, known as Old Man of the Mountain Cactus, small green columnar cactus with long brown spines and white hair on pebbles.
A small potted Old Man of the Mountain Cactus (Oreocereus trollii) with orange-brown spines and white fibers against a black background.
A small Oreocereus trollii (Old Man of the Mountain) cactus in a pot with long brown spines and white hair, on a plain background.
Oreocereus trollii cactus with white hair-like fibers and brown spines growing in a pot with small rocks against a black background.
Top view of Oreocereus trollii cactus, featuring white, wispy hairs and long brown spines radiating outward on a black background.
Oreocereus trollii cactus with long reddish spines and white hairs in a square black pot with gravel, on a plain light background.
Close-up of an Old Man of the Mountain Cactus ‘Oreocereus trollii’ with orange-brown spines and white hairs in a square gravel-top pot.
A small Oreocereus trollii cactus, with reddish-brown spines and white hair, sits in pebbly soil against a plain white background.
Close-up of Oreocereus trollii cactus with green columnar stem, white hair-like fibers, and long brown spines in a pot with pebbles.
Old Man of the Mountain Cactus ‘Oreocereus trollii’ with white hair-like spines in a pebble-filled pot against a black background.
Close-up of Oreocereus trollii cactus, featuring sharp brown spines and long white hairs over a green surface, on a gray background.
Oreocereus trollii cactus in a pot on gravel, with long reddish spines and white hairs, shown overhead with rocks in the background.
A person in a gray shirt holds an Old Man of the Mountain Cactus with orange spines and white hairs, potted in gravel.
A person in a gray shirt holds an Old Man of the Mountain Cactus with white hair-like fibers and orange spines in gravelly soil.
Close-up of Oreocereus trollii cactus with long white hairs and rust-colored spines, set against a sunlit greenhouse background.
Close-up of the Old Man of the Mountain Cactus ‘Oreocereus trollii’ with reddish-brown spines and white fibers among rocks and gravel.
A person holds an Old Man of the Mountain Cactus (Oreocereus trollii) in a black pot with gravel, orange spines, and white hairs.
Close-up of Old Man of the Mountain Cactus ‘Oreocereus trollii’ with long brown spines and white hair, potted in small rocks.
Close-up of Old Man of the Mountain Cactus ‘Oreocereus trollii’ with brown spines and white hair in a pebble pot, wooden background.
Close-up of an Old Man of the Mountain Cactus ‘Oreocereus trollii’ with white fibers and brown spines in a gravel pot on wood background.
Close-up of the Old Man of the Mountain Cactus ‘Oreocereus trollii’ with brown spines and white fibers in a pot with small rocks.
Oreocereus trollii cactus with white, hair-like spines in a black plastic pot filled with light gravel, set against a red brick wall.
The Old Man of the Mountain Cactus ‘Oreocereus trollii’ in a black plastic pot with pebbles, displayed on a white background.
Old Man of the Mountain Cactus (Oreocereus trollii) with white hairs and brown spines in a black pot with tan pebbles on white background.
Oreocereus trollii, or Old Man of the Mountain Cactus, in a black plastic pot with pebbles, set before a stone background and greenery.
Oreocereus trollii cactus with white hair-like fibers and sharp spines in a black pot with pebbles, set against a beige stone background.
A potted Oreocereus trollii cactus with white, hair-like fibers and long brown spines sits on pebbles before a stone-patterned backdrop.
Close-up of Old Man of the Mountain Cactus ‘Oreocereus trollii’ with long white hairs and brown spines in a pot with small rocks.
Oreocereus trollii, or Old Man of the Mountain Cactus, with long white hairs and spines in gravel against a rustic red brick wall.
Oreocereus trollii cactus with white, woolly spines and brown thorns in a black pot with rocks, shown beside a yellow tape measure.
Close-up of an Oreocereus trollii cactus, known as Old Man of the Mountain, with white hairs and brown spines in tan pebbles on white.
Oreocereus trollii cactus, tall and columnar with white fuzzy spines, in a black plastic pot with pebbles on a plain white background.

Introducing the Oreocereus trollii, known as the old man of the mountain cactus, which is a stunning member of the Oreocereus genus. It gets its name, Old Man of the Mountain cactus, from the long, white, woolly hairs that cover its cylindrical body, resembling the flowing beard of an old man. 

Native to Argentina and Bolivia, this shrubby columnar cactus has shaggy fine white hair that protects it from the night frost and the sun in the morning of high altitudes on arid mountains.  

The Oreocereus trollii can form a small clump of stems, each reaching up to 2 feet tall and 4 inches wide, with long, yellow-to-red hair-like radial spines that poke out of the wool. It grows slowly, adding new growth rings each year, which can be seen as distinct bands on its stem. With time, it develops a majestic presence in your garden or indoor space.  

The Oreocereus trollii flowers bloom during late spring to early summer, with stunning pink or violet-red flowers that emerge from the top of the plant. These semi-tubular blooms add a vibrant splash of color to its otherwise muted appearance, creating a delightful contrast against its shaggy white hairs. 

When it comes to Oreocereus trollii care, it loves full sun exposure. It is best to plant it in an area where it receives good bright light for at least 6 hours a day. Water the old man of the mountain cactus sparingly to prevent root rot and ensure the soil is fully dried out between two waterings. Avoid allowing the cactus to sit in water, as overwatering can cause it to die. During the winter months, it benefits from a period of dormancy with cooler temperatures and reduced watering.  

The Oreocereus trollii grows happily in a specialized well-drained soil mix. For outdoor cultivation, it is best suited for USDA zones 8 to 11. In colder regions, it is ideal for planting them indoors in warm temperatures between 50 - 75 F.  

To propagate this old man of the mountain cactus, you can collect its seeds or take stem cuttings. To harvest seeds, allow them to mature and dry before harvesting. For stem cuttings, choose a healthy stem and let it be callous for a few days before planting it in well-draining soil with lightly moist soil.  

With its unique appearance, this cactus makes for an eye-catching addition to rock gardens, xeriscapes, or desert-themed landscapes. Its shaggy white hair creates a striking contrast against the surrounding greenery or other desert plants. People often confuse the Old Man of the Mountain cactus, with the Old Man of the Andes cactus because of their similar names and the presence of shaggy white hairs on their bodies.  

So, if you're looking for a cactus that will add a touch of whimsy and intrigue to your garden, the Oreocereus trollii, the Old Man of the Mountain cactus, is definitely worth considering.  


Bloom Season

Late spring--early summer

Flower Color

Pink--violet red

Growth Rate

Slow

Hardiness Zone

8--9--10--11

Mature Size

2 ft. tall--4 in. wide

Plant Type

Cactus

Resistance

Extremely drought-tolerant--heat tolerant--pest resistance

Sun Exposure

Full sun (6+ hrs.)--Partial shade (3–6 hrs. sun)

Watering Needs

Low
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Growers Quick Reference Guide - Key Features

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Old Man of the Mountain Cactus ‘Oreocereus trollii’

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  • Description
  • Key Plant Features

Introducing the Oreocereus trollii, known as the old man of the mountain cactus, which is a stunning member of the Oreocereus genus. It gets its name, Old Man of the Mountain cactus, from the long, white, woolly hairs that cover its cylindrical body, resembling the flowing beard of an old man. 

Native to Argentina and Bolivia, this shrubby columnar cactus has shaggy fine white hair that protects it from the night frost and the sun in the morning of high altitudes on arid mountains.  

The Oreocereus trollii can form a small clump of stems, each reaching up to 2 feet tall and 4 inches wide, with long, yellow-to-red hair-like radial spines that poke out of the wool. It grows slowly, adding new growth rings each year, which can be seen as distinct bands on its stem. With time, it develops a majestic presence in your garden or indoor space.  

The Oreocereus trollii flowers bloom during late spring to early summer, with stunning pink or violet-red flowers that emerge from the top of the plant. These semi-tubular blooms add a vibrant splash of color to its otherwise muted appearance, creating a delightful contrast against its shaggy white hairs. 

When it comes to Oreocereus trollii care, it loves full sun exposure. It is best to plant it in an area where it receives good bright light for at least 6 hours a day. Water the old man of the mountain cactus sparingly to prevent root rot and ensure the soil is fully dried out between two waterings. Avoid allowing the cactus to sit in water, as overwatering can cause it to die. During the winter months, it benefits from a period of dormancy with cooler temperatures and reduced watering.  

The Oreocereus trollii grows happily in a specialized well-drained soil mix. For outdoor cultivation, it is best suited for USDA zones 8 to 11. In colder regions, it is ideal for planting them indoors in warm temperatures between 50 - 75 F.  

To propagate this old man of the mountain cactus, you can collect its seeds or take stem cuttings. To harvest seeds, allow them to mature and dry before harvesting. For stem cuttings, choose a healthy stem and let it be callous for a few days before planting it in well-draining soil with lightly moist soil.  

With its unique appearance, this cactus makes for an eye-catching addition to rock gardens, xeriscapes, or desert-themed landscapes. Its shaggy white hair creates a striking contrast against the surrounding greenery or other desert plants. People often confuse the Old Man of the Mountain cactus, with the Old Man of the Andes cactus because of their similar names and the presence of shaggy white hairs on their bodies.  

So, if you're looking for a cactus that will add a touch of whimsy and intrigue to your garden, the Oreocereus trollii, the Old Man of the Mountain cactus, is definitely worth considering.  


Bloom Season

Late spring--early summer

Flower Color

Pink--violet red

Growth Rate

Slow

Hardiness Zone

8--9--10--11

Mature Size

2 ft. tall--4 in. wide

Plant Type

Cactus

Resistance

Extremely drought-tolerant--heat tolerant--pest resistance

Sun Exposure

Full sun (6+ hrs.)--Partial shade (3–6 hrs. sun)

Watering Needs

Low
Attribute Value
Bloom Season Late spring, early summer
Botanical Name Oreocereus trollii
Common Name Old Man of the Mountain
Dormancy Winter
Family Cactaceae
Flower Color Pink, violet red
Genus Oreocereus
Growth Habit Shrubby columnar
Growth Rate Slow
Hardiness Zone 8, 9, 10, 11
Mature Size 2 ft. tall, 4 in. wide
Native Area Argentina
Plant Type Cactus
Propagation By seeds, stem cuttings
Resistance Extremely drought-tolerant, heat tolerant, pest resistance
Soil PH 6.5, Acidic, Neutral
Soil Type well-drained soil mix
Special Features Wooly foliage
Sun Exposure Full sun (6+ hrs.), Partial shade (3–6 hrs. sun)
Toxicity Safe for humans, mildly toxic for pets
Watering Needs Low

Growers Quick Reference Guide - Key Features

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