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Cactus quadrangularis

Four-Angled Cactus

Overview

Cactus quadrangularis is a historical cactus taxon, currently widely treated in botanical nomenclature as a synonym of Acanthocereus tetragonus (L.) Hummelinck 1. It is characterized by its distinct four-angled ribbed stems and scrambling growth habit.

Taxonomy and Naming

Originally described by Jacquin, this species has undergone several taxonomic reclassifications due to its variable vegetative form. Modern databases place it under the genus Acanthocereus 2.

Distribution and Habitat

This species is native to tropical regions of Central America, the Caribbean, and northern South America. It thrives in coastal scrublands, rocky terrains, and deciduous dry forests 3.

Appearance

The stems are dark green, prominently four-angled, and lined with clusters of sharp greyish spines along the margins. It produces large, nocturnal white flowers that are pollinated by moths 4.

Cultivation

In cultivation, it requires bright, filtered sunlight and a highly porous substrate. It is relatively drought-tolerant but benefits from moderate watering during the active growing season.

Common Cultivation Errors

Overwatering in compacted, heavy soils quickly leads to root rot. Insufficient light causes weak, spindly, and pale stem growth.

References

  1. Plants of the World Online (POWO), Royal Botanic Gardens, Kew. ↩
  2. International Plant Names Index (IPNI). ↩
  3. GBIF Secretariat (2023). GBIF Backbone Taxonomy. ↩
  4. Anderson, E.F. (2001). The Cactus Family. ↩
Light

Bright Indirect Light

Requires at least 6 hours of bright indirect or filtered direct sunlight daily.

Watering

10-25 Days

Allow the potting medium to dry out completely between waterings.

Soil

Well-draining, sandy and pumice-rich cactus soil mix

Prefers a sandy, well-draining substrate rich in pumice and coarse grit.

Safety

Pet Friendly

Non-toxic to pets, but possesses sharp spines that can cause mechanical injury.

Difficulty

Easy

Very easy to maintain, making it ideal for beginners and low-maintenance collections.

Native Habitat

Central America, Caribbean, and Northern South America

The species is widely distributed across the dry coastal regions and arid scrublands of tropical America.

Frequently Asked Questions

Where should Cactus quadrangularis be grown indoors?
Indoors, the ideal location is near a south- or west-facing window that receives plenty of bright light.
How often should it be watered in a pot?
Water roughly every 10 days in summer once the soil dries completely, and reduce to once a month in winter.
What type of soil should be used?
Use a well-draining cactus mix high in pumice, perlite, and coarse sand to prevent root rot.
Is it toxic to pets?
It is not chemically toxic, but its sharp, stiff spines pose a physical injury risk to pets.
When does Cactus quadrangularis bloom?
Once mature, it blooms typically during summer nights, producing large, funnel-shaped white flowers.
What is its growth rate?
It grows at a moderate rate compared to other cacti, adding several centimeters per year under optimal conditions.
Can I leave my cactus outside in winter?
It is frost-sensitive and should be brought indoors when temperatures drop below 5°C (41°F).
Why is my cactus stem growing thin and stretched?
This is etioliation, caused by insufficient light. Move the plant to a much brighter location.
When should it be repotted?
Repot in spring every 2-3 years, or when the roots begin to grow out of the drainage holes.
How should it be fertilized?
Apply a half-strength cactus fertilizer once a month during the spring and summer growing seasons.