Cactaceae
Torch Cactus (Cleistocactus)
Cleistocactus
An easy cactus for full sun or the brightest window in the house. It needs very fast-draining soil, moderate water in spring and summer and almost none in winter. Most species cannot survive freezing.
Every 14 days
Direct sun
2° - °C
% - %
Categories
What is Torch cactus?
Torch cactus (Cleistocactus) is a easy-care plant from the Cactaceae family. Cleistocactus is a genus of columnar cacti in the family Cactaceae, native to the mountains of South America, from Bolivia and Peru to Argentina, Paraguay and Uruguay, at altitudes up to 3,000 m. About 26 species are accepted today. The stems are slender, many-ribbed and covered in fine, sometimes h...
Torch cactus grows up to 3.0m, watering every 14 days. It is suitable for indoor environments and safe for pets.
Unlike many tropical plants, Torch cactus tolerates watering mistakes. Best for beginners. Unlike many popular species, Torch cactus is safe to keep around pets. Without adequate drainage, root rot can develop within 28 days.
How to Care for Torch cactus?
TLDR: Torch cactus needs Direct sun, watering every 14 days, and temperatures between 2-30°C with 40-70% humidity.
How Often Should You Water Torch cactus?
In spring and summer, water thoroughly when the mix is dry, usually every 2 weeks. From mid-autumn to spring, keep it almost dry: wet soil combined with cold is the main cause of root rot.
How Much Light Does Torch cactus Need?
Full sun or very bright light. In very hot climates, keep it away from heat reflected off walls and paving. Indoors in low light the stems grow thin and lean toward the window.
What Is the Best Soil for Torch cactus?
Use a sandy cactus mix with plenty of grit or perlite that does not hold water.
What Pot Should You Use for Torch cactus?
A terracotta pot with a drainage hole, heavy enough not to tip over under the tall stems.
Care Schedule
Fertilize
Every 30 days
What Is Torch cactus and Where Does It Come From?
Cleistocactus is a genus of columnar cacti in the family Cactaceae, native to the mountains of South America, from Bolivia and Peru to Argentina, Paraguay and Uruguay, at altitudes up to 3,000 m. About 26 species are accepted today. The stems are slender, many-ribbed and covered in fine, sometimes hair-like spines; they branch from the base and form clumps that can exceed 3 m, with stems that arch over with age. The flowers grow from the sides of the stems as narrow tubes that barely open, most often red but also orange, yellow, green, white or violet. They are pollinated by hummingbirds. The most widely grown species include silver torch (C. strausii) and golden rat tail (C. winteri).
How to Propagate Torch cactus?
Stem cutting
Do not water right after planting the cutting: moisture on a fresh cut causes rot.
- 1 Cut a healthy piece of stem with a clean knife, wearing gloves
- 2 Let the cut end dry in the shade until it calluses, 1 to 2 weeks
- 3 Stand the cutting upright on dry cactus mix
- 4 Start watering lightly once the first roots appear
Materials needed:
Seed
Seedlings grow slowly for the first few years and should not get strong sun at first.
- 1 Scatter the seed on fine cactus mix
- 2 Leave uncovered or cover with the thinnest layer of sand
- 3 Keep slightly moist in a bright, warm spot
Materials needed:
How Big Does Torch cactus Grow?
TLDR: Torch cactus can reach up to 3.0m tall with Medium growth rate.
Max height
3.0m
Foliage
Evergreen
Plant Uses
Ornamental
Great for decoration
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Torch cactus?
TLDR: Torch cactus is susceptible to 4 known diseases. Monitor regularly for early detection.
Root Rot
Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.
Overwatering
Overwatering occurs when plants receive too much water, depriving roots of oxygen and causing root rot. This environmental stress is one of the most common causes of houseplant death, as waterlogged soil prevents roots from breathing and functioning properly.
Mealybugs
Mealybugs are small, soft-bodied insects covered with a white, waxy, cottony material. They are common pests of houseplants and outdoor plants in mild climates. These sap-sucking insects feed on plant tissue, causing damage, stunted growth, and can lead to plant death if left untreated. They produce sticky honeydew which attracts sooty mold.
Cold Damage
Cold damage, also known as frost injury, occurs when plants are exposed to freezing or near-freezing temperatures. This environmental stress can cause cellular damage as ice crystals form within plant tissues, rupturing cells and disrupting normal plant functions. Chilling injury can also occur in sensitive species at temperatures between 32-55°F (0-10°C), even without actual freezing.
Fun Facts
The name comes from the Greek kleistos, "closed", because the flowers barely open.
Its tubular flowers are built for hummingbirds, which reach the nectar with their beaks.
Some species grow hanging from cliff faces in Bolivia.
Frequently asked questions
How often should I water a Cleistocactus?
Why don't the flowers open?
Can Cleistocactus handle cold?
Is it toxic to cats and dogs?
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Field Maple | Easy | Bright indirect | 14d | ✓ |
| Iberian Houseleek | Easy | Direct sun | 14d | ✓ |
| Silver Birch | Easy | Direct sun | 14d | ✓ |
| Common Blanketflower | Easy | Direct sun | 10d | ✓ |
