Light
Full Sun
Requires full, unfiltered direct sunlight throughout the day.
Reference image 
Reference image Echinocereus arizonicus
Arizona Red Hedgehog Cactus
Overview
Echinocereus arizonicus is a striking perennial succulent subshrub belonging to the Cactaceae family, highly celebrated for its brilliant scarlet-to-orange flowers 1. It is well-adapted to arid desert slopes and rocky terrains.
Classification and Naming
Classified under the genus Echinocereus, its specific epithet arizonicus highlights its primary native occurrence in the state of Arizona 1. It is commonly referred to as the Arizona red hedgehog cactus or Arizona claret-cup cactus.
Distribution and Habitat
This species is native to the Southwestern United States (primarily central and southeastern Arizona) and parts of Northern Mexico 2. It thrives on limestone cliffs, steep rocky slopes, and desert grasslands within arid biomes.
Appearance
It forms clusters of cylindrical, grey-green stems growing from the base. Each stem features distinct ribs heavily armed with sharp spines. In late spring, it produces magnificent, funnel-shaped, bright red-orange blossoms that are highly attractive to hummingbirds and bees 1.
Cultivation
It requires full sun and exceptionally well-draining, mineral-based soil. During its winter dormancy, it can tolerate freezing temperatures down to -10 °C, provided the soil is kept bone-dry to prevent root rot 2.
Common Cultivation Mistakes
Overwatering during cold periods or using organic-heavy soils that retain moisture is the most common cause of root rot. Lack of adequate direct sunlight leads to weak, stretched growth (etiolation) and failure to produce blooms.
References
Watering
10-35 Days
Water only after the substrate is bone dry. No water during winter dormancy.
Soil
Highly gritty, mineral-rich cactus soil with abundant pumice and coarse sand
Gritty, fast-draining mineral mix with plenty of pumice and coarse sand.
Safety
Pet Friendly
Non-toxic, but sharp spines require cautious handling and keeping away from pets.
Difficulty
Moderate
Moderately easy if overwatering is strictly avoided and winter cold is kept dry.
Native Habitat
North America, Southwestern USA, Northern Mexico
Native to the rugged rocky slopes and canyons of Arizona and northern desert states of Mexico, where it grows in nutrient-poor limestone soils under harsh desert sun.
Frequently Asked Questions
How often should Echinocereus arizonicus be watered?
During the active spring and summer growth phases, water only after the soil is completely dry (roughly every 10 days). Stop watering entirely in winter.
Is it toxic to pets?
No, it is non-toxic. However, its sharp, stiff spines pose a physical hazard to curious pets and should be kept out of reach.
What is required for this cactus to bloom?
Abundant direct sunlight and a cold, dry winter dormancy period are essential for triggering the development of its red flower buds.
What kind of soil should be used?
A mineral-heavy cactus soil mix with excellent drainage, containing high proportions of pumice, coarse sand, and very little organic matter.
When should it be repotted?
Typically every 2-3 years in early spring, just before the active growing season starts, choosing a slightly larger container with drainage holes.
Is it cold hardy during winter?
Yes, it is cold-hardy down to about -10 °C (14 °F), but only if the soil is kept completely dry. Wet winter cold will cause rot.
Can it grow in partial shade?
It can survive, but it will suffer from etiolation (stretching) and is highly unlikely to produce its signature red flowers.
How fast does it grow?
It is a slow-growing cactus. It takes several years to establish and reach blooming size from seed or offsets.
What is the most common disease?
Root rot and fungal infections caused by overwatering and poor soil aeration are the most frequent issues.
How should it be fertilized?
Apply a diluted cactus fertilizer at half-strength once a month during the active growing season of spring and summer.