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Echinocereus weinbergii

Weinberg's Hedgehog Cactus

Overview

Echinocereus weinbergii is an exquisite, low-growing cactus species within the family Cactaceae. Known for its flattened-globose shape and tightly appressed spines, this slow-growing succulent subshrub is highly valued by plant enthusiasts but requires careful watering and specific care conditions 1.

Taxonomy and Naming

Originally described under the genus Echinocereus, this species is sometimes taxonomically treated as a variant of Echinocereus pulchellus (specifically E. pulchellus var. weinbergii). However, modern botanical literature often distinguishes it due to its unique depressed stem morphology and specific habitat preferences 2.

Distribution and Habitat

Native to the arid and semi-arid regions of central and northern Mexico, including Zacatecas, San Luis Potosí, and Durango. It thrives in high-altitude desert grasslands and dry shrublands, typically growing in calcareous, mineral-rich soils among grasses 1.

Appearance

The stem is light green to grayish-green, noticeably flattened or disk-shaped, sitting low in the substrate. It features prominent ribs with small aeroles bearing short, pectinate (comb-like) spines that lay flat against the stem. In late spring, it produces large, striking pink to magenta funnelform flowers from the crown 2.

Cultivation and Care

This species demands bright, filtered sunlight to preserve its compact form. While it tolerates morning sun, harsh afternoon rays can cause scorching. It requires an open, mineral-heavy substrate with minimal organic matter and must be kept completely dry during winter dormancy to prevent rot 1.

Common Cultivation Errors

The most frequent error is overwatering, especially during the cold winter months, which quickly triggers root rot. Insufficient light leads to etiolation, causing the naturally flat stem to stretch and weaken. Using heavy, clay-rich soil is also detrimental.

Bibliography

References

  1. Kew Plants of the World Online (POWO): Distribution data and morphological profiles for "Echinocereus weinbergii". ↩
  2. GBIF (Global Biodiversity Information Facility): Herbarium specimens and field records across Mexican states. ↩
Light

Bright Indirect Light

Requires bright, filtered sunlight. Morning sun is ideal; protect from scorching midday summer heat.

Watering

12-35 Days

Follow a strict 'soak and dry' method. Keep entirely dry and cool throughout the winter dormancy.

Soil

Fast-draining, highly porous cactus mix with pumice, quartz sand, and minimal organic matter.

Use a grit-heavy mix composed of pumice, coarse sand, and limestone gravel, with very low organic content.

Safety

Pet Friendly

Spines are short and relatively flat, but still require careful handling. Non-toxic to cats and dogs.

Difficulty

Moderate

Moderate care level; success relies heavily on strict watering control and cold-dry winter resting.

Native Habitat

Mexico (Zacatecas, San Luis Potosí, Durango)

Native to high-altitude grassy semi-deserts and limestone slopes in central and northern Mexico.

Frequently Asked Questions

Can Echinocereus weinbergii be grown indoors?
Yes, but it requires a very bright spot, such as a south or west-facing window. Insufficient light will cause the plant to etiolate and lose its flat shape.
How often should I water this cactus?
During summer, water only when the soil is completely dry (about every 12 days). Cease watering entirely during the winter months.
What is the best soil mix for this cactus?
An extremely well-draining mineral mix containing 70-80% inorganic matter like pumice, perlite, and coarse sand is highly recommended.
Does Echinocereus weinbergii bloom?
Yes, it produces large, showy pink to magenta funnel-shaped flowers from the crown of the stem in late spring or early summer.
Is it cold hardy during winter?
It can tolerate brief drops down to -5°C (23°F), but only if the soil is kept absolutely bone dry. Protect it from freezing wet conditions.
Why is my cactus growing tall and skinny?
This is called etiolation and is caused by insufficient light. Move your cactus to a much brighter location with more direct sunlight.
Is it toxic to pets?
Echinocereus weinbergii is non-toxic to cats and dogs, though its small spines can still cause minor physical irritation if chewed.
How fast does it grow?
It is a very slow-growing cactus. It takes several years to reach its mature, flattened-globose size.
How often should I fertilize?
Apply a diluted cactus fertilizer at half-strength once a month during the active growing season (spring and summer) only.
When should I repot this cactus?
Repot every 2 to 3 years in early spring, only when the root system has completely filled the current container.