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Lophocereus glaziovii

Glaziou's Columnar Cactus

Overview

Lophocereus glaziovii (frequently treated under its accepted synonym Arthrocereus glaziovii) is an extremely rare, endangered columnar cactus endemic to the highland regions of Brazil 1. Known for its slender stems and elegant nocturnal blooms, it is a highly prized species among succulent enthusiasts.

Taxonomy and nomenclature

Belonging to the family Cactaceae, this species was originally described by the German botanist Karl Schumann. Over the decades, its classification has shifted between the genera Lophocereus and Arthrocereus 2. The specific epithet "glaziovii" honors the French botanist and landscape architect Auguste François Marie Glaziou.

Distribution and habitat

This species is strictly endemic to the high-altitude "campos rupestres" (rocky fields) of Minas Gerais, Brazil 1. It thrives at elevations above 1,000 meters, growing in iron-rich, shallow soils among quartz outcrops and rock crevices under intense light conditions.

Appearance

It features slender, cylindrical, erect stems that branch from the base. The dark green stems are divided into 10 to 15 shallow ribs, densely set with small areoles bearing fine, brownish-to-greyish spines. During the summer, it produces large, fragrant, funnel-shaped white flowers that open at night to attract nocturnal pollinators 2.

Care in cultivation

In cultivation, it requires a very bright position with filtered sunlight and excellent drainage. Water thoroughly during the spring and summer active growth phase only when the soil has dried out completely. It is sensitive to frost and should be overwintered in a cool, dry room at temperatures above 8°C.

Common cultivation mistakes

Overwatering and using heavy, clay-rich soil are the most common causes of root and stem rot. Lack of adequate winter rest in cool temperatures can also prevent the plant from blooming.

References

  1. IUCN Red List of Threatened Species - Arthrocereus glaziovii Assessment. ↩
  2. Taylor, N.P. & Zappi, D.C. (2004). Cacti of Eastern Brazil. Royal Botanic Gardens, Kew. ↩
Light

Bright Indirect Light

Provide plenty of bright, indirect light or filtered sun to prevent the columnar stems from stretching and thinning.

Watering

8-25 Days

Water only when the substrate is thoroughly dry; keep nearly dry during the winter dormancy.

Soil

Highly porous, sandy and pumice-rich mineral soil mix

Requires an extremely porous mineral substrate mixed with pumice, quartz sand, and very little organic matter.

Safety

Contact/Ingestion Risk

Features fine, sharp spines; keep out of reach of curious pets and children to avoid injury.

Difficulty

Moderate

Moderately demanding due to its strict watering requirements and sensitivity to wet winter cold.

Native Habitat

Brazil (Minas Gerais)

Endemic to the high-altitude rocky plateaus and iron-bearing fields of Minas Gerais, Brazil.

Frequently Asked Questions

How often should I water Glaziou's Columnar Cactus?
Water it only when the soil has completely dried out during spring and summer (roughly every 8 days). In winter, withhold water almost entirely.
Is this cactus toxic to pets?
It is non-toxic, but its fine and sharp spines can cause physical injury to pets, so caution is advised.
What potting mix should I use?
Use a highly mineral-based cactus mix with high proportions of pumice, lava rock, and coarse sand for excellent drainage.
How much sunlight does Glaziou's Columnar Cactus need?
It thrives in abundant bright, indirect light or filtered sunlight. Protect it from the scorching direct midday sun.
When does this cactus bloom?
Mature specimens produce fragrant, white, funnel-shaped flowers that open at night during the summer months, provided they had proper winter dormancy.
Where should I keep the cactus in winter?
Keep it in a frost-free, dry, and cool room (around 8-12°C) without providing any water.
What is its growth rate?
It is generally a slow-to-moderate grower and does not require frequent repotting.
What causes shriveling or softening of the stem?
Softening is usually a sign of root rot due to overwatering, while shriveling typically indicates extreme dehydration. Inspect the roots and soil.
When should I repot this cactus?
Repot only in early spring when the roots begin to crowd the pot, moving it to a container just one size larger.
How does air humidity affect this plant?
It dislikes high humidity; dry air conditions greatly reduce the risk of fungal infections.