Oreocereus Trollii

Oreocereus Trollii Cactus Care & Buying Guide


Light requirements High
Water requirements Low
Ease of care Easy
Size Large
Toxicity Non-toxic
Zone 9a
Temperature resistance Mildly frost-hardy
Growth speed Fast
Indoor growing Suitable


Taking Care Of Oreocereus Trollii

Ideal conditions

Due to its light demands, Oreocereus Trollii should be kept outdoors, though it can also thrive indoors if provided with direct sunlight.

The Oreocereus Trollii cactus can survive in quite a wide range of temperatures. These cacti mostly do alright at temperatures as low as 20 degrees Fahrenheit (-6.7 degrees Celsius), and they are also quite resistant to heat thanks to their hair.


Water Oreocereus Trollii just like any other succulent – when the soil is dry to the touch. This cactus is drought-resistant and thus doesn’t need much water, though it should be watered regularly for best results.

Avoid overwatering the Oreocereus Trollii cactus – like many other cacti, this cactus is sensitive to standing water and may even develop root rot due to it.

If your area is rainy, then you may not need to water your Oreocereus Trollii manually. Only water the cactus yourself when its soil is dry and no rain is expected.

In winter months, reduce the water supply to this cactus – Oreocereus Trollii gets dormant and has reduced water needs in winter. You may lightly water it once or twice a month, but be very careful with winter watering since root rot is much easier to trigger in winter than in summer.

Where to plant

Plant Oreocereus Trollii in a fast-draining cactus potting mix to prevent water from accumulating around the cactus’ roots. For added drainage, you may add perlite or pumice in a 1:1 ratio or even more.

If planting the Oreocereus Trollii cactus in a pot, be sure to pick a pot with large drainage holes at the base.

Outdoors is where Oreocereus Trollii does best, so we recommend that you do keep your cactus outside where the plant will have easy access to direct sunlight.

Though the Oreocereus Trollii cactus is pretty resistant to heat, you should move it to a shaded location during heatwaves or extreme heat just in case.

If you are planning to keep the Oreocereus Trollii cactus indoors, then make sure to place it on a sunny window sill that receives direct sunlight all day. 

General care information

Aside from the above, you’ll also need to occasionally fertilize and repot your Oreocereus Trollii cactus.

Fertilization isn’t required if you’ve just repotted the cactus into fresh soil. Otherwise, dilute a cacti fertilizer into half strength and fertilize the soil once every 4-8 weeks, depending on your mix.

As for repotting, the Oreocereus Trollii cactus grows up to 12 feet tall and around 4 inches wide, so your cactus may require repotting quite a few times throughout its lifetime.

Before repotting, allow the soil to dry. Remove the plant from the soil, inspect its roots, and remove any parts that are rotten or damaged. Then, place the cactus into new soil and don’t water it for around a week to allow it to recover.