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PlantSnap
Plant Care
Blue torch cactus
(Pilosocereus pentaedrophorus)
Also Known As
Blue torch cactus, Pentahedron cactus
About This Plant
Pilosocereus pentaedrophorus is a species of cactus that has a cylindrical stem with five or six sides. It can grow up to 10 meters (33 feet) tall and 15 cm (6 inches) in diameter. It has small, white, spiny areoles that produce yellowish-brown spines. The plant produces beautiful, large, white flowers that bloom at night and are pollinated by bats.
Plant Care Instructions
Outdoor Size Range
Can grow up to 10 meters (33 feet) tall and 15 cm (6 inches) in diameter
Light Requirements
Pilosocereus pentaedrophorus requires full sunlight to partial shade. It can tolerate direct sunlight but may need some shade during the hottest part of the day.
Humidity Needs
Pilosocereus pentaedrophorus prefers dry air and does not require high humidity levels.
Fertilizing Schedule
The plant does not require frequent fertilization. Use a low-nitrogen cactus fertilizer once a month during the growing season.
Pruning Guidelines
Pruning is not necessary for this plant. However, you can remove any dead or damaged branches to promote new growth.
Common Pests and Diseases
Pilosocereus pentaedrophorus is generally not susceptible to pests or diseases. However, it may be attacked by mealybugs or spider mites.
Indoor Size Range
Not suitable for indoor growth
Watering Schedule
The plant requires infrequent watering, about once a month during the growing season. It is drought-tolerant and can survive long periods without water.
Temperature Range
The plant can tolerate a wide range of temperatures, from 10°C (50°F) to 38°C (100°F). However, it is best to keep it in a warm, dry environment.
Growing Season
The growing season for Pilosocereus pentaedrophorus is from spring to fall.
Growing Difficulty Level
Pilosocereus pentaedrophorus is relatively easy to grow and care for, making it a good choice for beginners.
USDA Hardiness Zones
Pilosocereus pentaedrophorus is hardy in USDA zones 9b to 11.
Did You Know?
The fencepost cactus is so named because its stems were used as fence posts by early settlers in the southwestern United States.
