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Plant Care
Hairbrush cactus
(Pachycereus pecten-aboriginum)
Also Known As
Hairbrush cactus, Mexican fence post cactus, Cactus de ahorcado
About This Plant
Pachycereus pecten-aboriginum is a species of cactus that is native to Mexico. It has a tall, columnar shape and can grow up to 20 feet (6 meters) tall. The plant has a greenish-gray color and is covered in spines. It produces small, white flowers that bloom at night and are followed by edible red fruit.
Plant Care Instructions
Outdoor Size Range
Up to 20 feet (6 meters) tall and 3 feet (1 meter) wide
Light Requirements
Pachycereus pecten-aboriginum requires full sun to partial shade. It should be placed in a location that receives at least 6 hours of direct sunlight per day.
Humidity Needs
Pachycereus pecten-aboriginum prefers low humidity and can tolerate dry air.
Fertilizing Schedule
Fertilize once a month during the growing season with a cactus-specific fertilizer. Do not fertilize in the winter months.
Pruning Guidelines
Prune only to remove dead or damaged branches. Wear gloves and use caution when handling this cactus as the spines are sharp.
Common Pests and Diseases
Common pests include scale insects, mealybugs, and spider mites. These can be treated with a solution of water and dish soap or with a neem oil spray.
Indoor Size Range
Not suitable for indoor growth
Watering Schedule
This cactus is drought-tolerant and should only be watered when the soil is completely dry. During the growing season, water once a week. In the winter months, reduce watering to once a month.
Temperature Range
This cactus prefers warm temperatures between 70-90°F (21-32°C) during the day and 50-60°F (10-15°C) at night.
Growing Season
The growing season for Pachycereus pecten-aboriginum is from spring to fall.
Growing Difficulty Level
Pachycereus pecten-aboriginum is a relatively easy plant to grow as long as it is provided with the right conditions.
USDA Hardiness Zones
Pachycereus pecten-aboriginum is hardy in USDA zones 9b-11.
Did You Know?
The Native Mexican fencepost cactus is named for its long, straight stems which were traditionally used as fenceposts by indigenous people in Mexico.
