Red-Headed Irishman
Mammillaria spinosissima rubrispina · Native to Mexico (Guerrero, Morelos)
A vivid pincushion cactus with a bold personality — its dense cylinder of ruby-red spines makes it one of the most colorful cacti in any collection.
Available in 4½ inch
Care
Light
Bright, direct light enhances the deep red spine color. A sunny south-facing window is ideal.
Water
Allow soil to dry fully between waterings. Water sparingly in winter.
Soil & Feeding
Use a well-draining cactus mix. Feed monthly in the growing season with a diluted cactus fertilizer.
Quick Tip
More light = more intense spine color — a sun-drenched spot is where it truly shines.
Details
A cylindrical Mammillaria prized for its vivid, densely packed ruby-red spines and cheerful rings of pink flowers in spring — compact, colorful, and easy to grow.
- ✅ Intensely red, densely packed spines unlike most Mammillarias
- ✅ Blooms reliably in spring with a ring of pink flowers
- ✅ Compact and columnar — perfect for sunny shelves and windowsills
Size
Available in a 4½ inch pot — a great starter size that’s easy to place on a windowsill, desk, or shelf, and simple to repot as it grows.
Good to Know
⚠️ Very dense, sharp spines — handle with thick gloves. Keep away from children and pets.
Plant Bio
Mammillaria spinosissima rubrispina · also called the Red-Spined Pincushion
Native to the warm, rocky slopes of Guerrero and Morelos in Mexico, this is one of the most spine-dense Mammillarias — so covered in ruby-red spines that the green body beneath is barely visible.
Its cylindrical stem bears dense, interlocking white radial spines and vivid wine-red to ruby central spines, creating a bold, all-over color effect.
Each spring it produces a neat ring of small pink to carmine flowers around the upper portion of the stem, adding color on color to an already striking plant.
What makes it special?
- One of the most spine-dense Mammillarias, with near-total ruby-red spine coverage.
- The vivid red spine color is far more intense than most pincushion cacti.
- Tolerates a range of indoor conditions while staying compact and tidy.
Note: Very dense, sharp spines — handle with thick gloves. Keep away from children and pets. Grown for ornamental purposes only.