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Red headed cactus
Encyclopedia

Red headed cactus

Mammillaria spinosissima

cactusInterior/Exteriorfloraciónfácil
FamilyCactaceae
OriginMexico
ToxicityToxic

Mammillaria spinosissima, commonly known as the Red-headed Irishman, is a popular cylindrical cactus prized for its dense covering of reddish-brown spines and vibrant floral displays. It typically grows as a single column or in small clusters, reaching up to 30 centimeters in height. Its most striking feature is the "crown" of small, bright pink or deep magenta flowers that emerge in a perfect ring near the top of the stem during the spring.

Belonging to the Cactaceae family, this species is native to the central regions of Mexico, where it thrives in rocky environments at high altitudes. It is expertly adapted to arid conditions, storing water in its succulent body and using its dense spines to reflect intense sunlight and deter herbivores. The plant's tuberous roots allow it to anchor firmly into crevices, making it a resilient survivor in its natural mountain habitat.

In cultivation, this cactus is considered an excellent choice for beginners due to its hardiness and predictable blooming cycle. It requires very well-draining soil and plenty of light to maintain its compact shape and intense spine coloration. While it is generally non-toxic, its sharp spines can cause skin irritation, so it should be handled with care or using thick gloves. It is a frequent favorite in succulent collections worldwide.

Care

Watering

Every 2-3 weeks in summer; keep dry during winter months.

Light

Full sun or very bright indirect light, 6+ hours daily.

Temperature

Prefers 10°C to 30°C; protect from temperatures below 5°C.

Soil

Well-draining cactus mix with sand, perlite, or volcanic rock.

Fertilizer

Diluted cactus fertilizer once in spring during active growth.

Image gallery

Red headed cactus 1

In bloom?

Examples shared by the community when the plant was in bloom

Red headed cactus en flor 1

Common diseases

Potential pests (spider mites) or harmless spiders; some basal corking.

1 cases

Advice:
  • Inspect the webbing for tiny moving mites and gently clean the plant with a soft brush.
See full guide →

Plants from the same family

San Pedro Cactus
San Pedro CactusEchinopsis pachanoi

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