4 SIDED Astrophytum Myriostigma (Bishop's Cap)

These Astrophytum are all 4 RIBBED or 4 SIDED which is more rare in the species.

Astrophytum myriostigma, also known as the Bishop’s Cap, is a spineless, sculptural cactus beloved for its clean geometry and speckled, chalk-dusted appearance. This species typically has five sharply defined ribs (though 3–8 is possible), and its round, star-like shape gives it a minimalist, almost mathematical elegance.

Covered in a fine layer of white trichomes (tiny hairs), the surface appears frosty or speckled, especially under bright light. Native to the highlands of northeastern Mexico, A. myriostigma is drought-tolerant, slow-growing, and ideal for collectors who appreciate architectural form and simplicity.

☀ Light Requirements
Prefers bright, indirect light to full sun. More light = more trichome coverage and compact growth. Indoors, place near a sunny window. Outdoors, protect from scorching afternoon sun in very hot climates.

💧 Watering Needs
Water deeply but infrequently. Let soil dry out completely between waterings. During winter dormancy, water sparingly or not at all.

🌡 Temperature Tolerance
Cold-hardy to around 25–30°F in dry conditions. Protect from frost if the soil is wet or temperatures dip for extended periods. Add a [Heat Pack] for cold-weather shipping.

✨ Special Features
• Geometric Form – Star-shaped body with clean rib structure
• Frosted Appearance – Covered in white trichomes for a speckled, matte finish
• Spineless Beauty – One of the few cacti without spines—friendly to handle and display

Other Common Names:
Bishop’s Cap, Monk’s Hood Cactus, Star Cactus

This cactus will ship bare root and will be ready to place directly in a well draining soil mix like our Custom Cactus Mix.

Photos in the listings unless otherwise specified are representative of the plant that will be sent to you.
However, Plants grow differently and each plant may vary slightly in shape, size, growth pattern, etc.
Of course, if you receive a plant that you are dissatisfied with please reach out to us. We want to make it right!

If temperatures near you are below 45℉ we highly recommend adding a Heat Pack to your order.
If temperatures where you live will be much lower than 20℉ even heat packs may not work. You may consider waiting until things warm up a bit. We know you love your plants just like we do and we wouldn't want any of them to freeze.