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Arthrocereus glaziovii

Glaziou's Jointed Cactus

Overview

Arthrocereus glaziovii is a rare, endangered succulent subshrub belonging to the family Cactaceae. Known for its jointed stems and beautiful nocturnal flowers, this species is highly prized by collectors but faces severe extinction risks in the wild 1.

Taxonomy and Naming

Classified under the genus Arthrocereus, this species was formally described by Karl Moritz Schumann. The specific epithet "glaziovii" honors Auguste François Marie Glaziou, a prominent French botanist and landscape designer who collected extensively in Brazil during the 19th century 2.

Distribution and Habitat

This species is strictly endemic to the state of Minas Gerais in southeastern Brazil. It thrives in specialized iron-rich rocky soils known as "canga" within the "campo rupestre" vegetation zone, mostly at high elevations. Its natural habitat is severely fragmented due to intensive iron ore mining 13.

Appearance

Arthrocereus glaziovii has a shrubby, semi-erect growth habit with cylindrical, jointed stems. The stems are dark green, bearing 10 to 12 low, rounded ribs. Areoles are closely spaced, carrying numerous thin, needle-like, brownish-grey spines. The nocturnal flowers are funnelform, white to pale cream, and emit a subtle fragrance to attract night-pollinating insects 2.

Cultivation

In cultivation, it requires a mineral-heavy substrate that mimics its natural iron-rich and quartz-rich soils. Bright, indirect light or filtered sunlight is ideal. Watering should be deep but infrequent, allowing the substrate to dry completely between cycles. During winter, it should be kept cool and dry to induce dormancy 3.

Common Cultivation Mistakes

The most common issues arise from waterlogged soils and high humidity. Using organic-rich potting soils will quickly lead to root rot. Insufficient light results in weak, etiolated stems.

Bibliography

References

  1. IUCN Red List of Threatened Species: Arthrocereus glaziovii (https://www.iucnredlist.org) ↩
  2. Anderson, E. F. (2001). The Cactus Family. Timber Press. ↩
  3. Taylor, N. P., & Zappi, D. C. (2004). Cacti of Eastern Brazil. Royal Botanic Gardens, Kew. ↩
Light

Bright Indirect Light

Requires bright indirect light or filtered morning sun for optimal growth.

Watering

10-30 Days

Water only when the medium is 100% dry; keep dry in winter.

Soil

Well-draining, mineral-rich cactus mix with quartzite sand and gravel

Excellent drainage is vital; use quartzite gravel and pumice grit.

Safety

Pet Friendly

Non-toxic, but features sharp spines that require careful handling.

Difficulty

Moderate

Moderate; demands strict watering discipline to prevent root rot.

Native Habitat

Brazil (Minas Gerais)

Native to the iron-rich mountain ranges and rocky savannahs of Minas Gerais, Brazil, growing in highly specialized canga soils.

Frequently Asked Questions

Can Arthrocereus glaziovii be grown indoors?
Yes, it can be grown indoors if provided with plenty of bright indirect light and a well-ventilated, low-humidity environment.
How often should I water this cactus?
Water about every 10 days in summer once the soil dries completely. In winter, reduce watering to once a month or suspend it almost entirely.
What type of soil mix should I use?
Use a highly gritty cactus soil containing plenty of pumice, lava rock, river sand, and a very small amount of organic peat.
Does Arthrocereus glaziovii produce flowers?
Yes, it produces fragrant, tubular white or cream flowers that open at night during the summer months.
Is it toxic to pets?
No, it is non-toxic, but its sharp, fine spines can cause physical injury to pets' paws or mouths.
How fast does it grow?
It is a slow to moderate grower, taking several years to develop its branching, shrubby form in a container.
What temperature does it need in winter?
Providing a cool winter rest period at temperatures between 8-12°C is beneficial for its health and future blooming.
What is the most common cause of death?
Root and stem rot caused by overwatering and poorly draining, heavy soils.
Can it get sunburned?
If unaccustomed plants are exposed to intense direct summer afternoon sun, permanent yellow-brown sunburn scars can occur on the stems.
When should I repot it?
Repot in early spring every 2-3 years, or when the roots have fully congested the current container.