Rainbow hedgehog cactus

Echinocereus rigidissimus

Family:: Cactaceae
Elevation:: 4,000 ft – 7,500 ft
Bloom:: Apr – Jun
Region:: Southwest

A solitary, cylindrical hedgehog cactus whose dense, comb-like spines form alternating bands of pink, white, and rust that spiral up the stem like a rainbow. In late spring it crowns itself with large, silky magenta flowers with paler throats — one of the desert's most photographed miniatures.

Care · tuned to the Southwest

Water

Highly drought tolerant; water lightly during the growing season and keep nearly dry in winter. Very prone to rot if overwatered.

Sun & exposure

Full sun; the dense spine cover shields it from intense heat.

Soil

Demands extremely sharp, gritty, mineral-rich soil; tolerates alkaline, rocky ground.

In the Southwest

Cold-hardy to roughly 0–10°F when kept dry. The tightly appressed comb spines form colored bands from seasonal growth. Small but sharp; flowers attract native bees. Buy only nursery-propagated plants.

Common problems & fixes

Basal rot from overwatering or winter wet
Fix — Use a very gritty mineral mix, water sparingly, and keep bone-dry when dormant and cold.
Sunscald when abruptly moved from shade to full sun
Fix — Acclimate gradually to strong light over several weeks to protect the epidermis.

Pets & toxicity

Not toxic to pets; the only hazard is the dense, sharp spines, which prick but rarely cause the deep injuries of barbed cholla joints.

Easy to confuse with

Echinocereus pectinatus — similar comb spines but larger flowers, more southern
Lace hedgehog (Echinocereus reichenbachii) — finer spines, less color banding, clustering

Sources

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