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Echinocereus coccineus

Scarlet Hedgehog Cactus

Overview

Echinocereus coccineus, commonly known as the scarlet hedgehog cactus, is a clumping, highly cold-hardy succulent belonging to the family Cactaceae. It is celebrated for its spectacular, chalice-shaped scarlet-to-orange blooms that emerge in spring 1.

Taxonomy and Naming

Originally described by George Engelmann, the genus name 'Echinocereus' combines the Greek 'echinos' (meaning hedgehog) with the Latin 'cereus' (meaning wax candle). The specific epithet 'coccineus' translates to scarlet, directly referencing the plant’s vibrant flower color 2.

Native Range and Habitat

This species is native to the Southwestern United States (including Texas, New Mexico, Colorado, and Arizona) and Northern Mexico 1. It thrives in high-elevation habitats ranging from 1,000 to 3,000 meters, typically growing in rocky outcrops, gravelly slopes, and open pine-juniper woodlands.

Appearance

The plant forms dense mounds composed of dozens of cylindrical, ribbed stems armed with strong, needle-like spines. The brilliant red flowers open in late spring and are uniquely adapted for pollination by hummingbirds due to their tubular, nectar-rich structure 3.

Cultivation

Cultivating this species requires maximum sunlight exposure and exceptionally well-draining mineral soil. Water must be applied sparingly, allowing the substrate to dry out entirely between waterings. Cold winter dormancy is crucial for optimal health and flowering.

Common Care Mistakes

The most frequent errors in cultivation include insufficient direct sunlight, which causes weak, elongated growth (etiolation), and overwatering during the cold winter dormancy phase, leading to root rot.

Bibliography

References

  1. Plants of the World Online (POWO), Royal Botanic Gardens, Kew. ↩
  2. GBIF (Global Biodiversity Information Facility) Database. ↩
  3. IUCN Red List of Threatened Species - Echinocereus coccineus. ↩
Light

Full Sun

Requires full, direct sun. Insufficient light leads to pale, weak, and stretched stems.

Watering

10-30 Days

Water thoroughly only when the soil is completely dry. Keep bone dry in winter.

Soil

Fast-draining, mineral-rich, loamy cactus mix with pumice

Highly porous mineral mix with coarse sand, pumice, and minimal organic matter.

Safety

Pet Friendly

Armed with sharp spines that can cause puncture wounds. Non-toxic but keep away from pets.

Difficulty

Easy

Very easy. Highly resilient to both cold temperatures and drought conditions.

Native Habitat

South-Central USA and Northern Mexico

Thrives in the high-elevation rocky slopes, canyons, and arid mountains of the Southwestern United States down into northern Mexican states.

Frequently Asked Questions

Can Echinocereus coccineus be grown indoors?
Yes, but it requires very high levels of direct sunlight. A south-facing windowsill with direct sun is ideal.
How often should I water the Scarlet Hedgehog Cactus?
Water only when the soil is completely dry (about every 10 days in summer). Suspend watering entirely in winter.
Is this cactus cold-hardy during winter?
Yes, this cactus is highly cold-hardy and can withstand freezing temperatures down to -20°C, provided the soil is kept bone dry.
How do I get it to bloom?
Allowing the plant to go through a cold, dry winter dormancy period is essential to trigger spring budding.
What type of soil should I use?
Choose a highly porous cactus mix containing plenty of pumice, lava rock, and coarse sand for excellent drainage.
Is Echinocereus coccineus toxic to pets?
It is non-toxic, but its sharp, rigid spines can cause physical injury, so it should be kept out of reach of pets.
Why is my cactus stretching and becoming pale?
This is etiolation, caused by a lack of adequate light. Move the cactus to a brighter spot with direct sunlight immediately.
How fast does it grow?
It is a slow-to-moderate grower, gradually producing offsets over the years to form beautiful, dense mounds.
When should I repot it?
Repot in early spring only when the plant has outgrown its current pot and roots are visible at the bottom drainage holes.
The base of my cactus is getting soft, what should I do?
Softness at the base indicates root rot from overwatering. Stop watering immediately, cut away rotten parts, or take cuttings of healthy stems to propagate.