Bishop's cap cactus (Astrophytum myriostigma)
Care, watering, light and tips for Bishop's cap cactus on Floravia.
Quick facts
- Family: Cactaceae
- Difficulty: Easy to care for
- Watering: every 21 days
- Light: Full sun
- Temperature: 10–40 °C
About Bishop's cap cactus
Astrophytum myriostigma, commonly known as Bishop's Cap Cactus, is a spineless cactus with a spherical to columnar shape, characterized by its distinctive marked ribs and often covered with small white dots that give it a velvety appearance. Its geometric form and unique texture make it ideal for cactus and succulent collections, as well as for indoor displays with bright light. It is a compact plant that adds a sculptural touch to any space.
Native range
Mexico and the southern United States
Care tips
It requires direct or very bright sunlight to thrive and maintain its compact shape; a south-facing window is ideal. Watering should be sparse and infrequent, allowing the substrate to dry out completely between waterings, especially in winter when it goes dormant. Use a very porous substrate with excellent drainage, specifically for cacti and succulents. The most common mistake to avoid is overwatering, which can quickly rot its roots and base.
How to save a dying Bishop's cap cactus
- Warning signs
- Softening of the body, brown/black spots, lack of growth, and pale color.
- First aid
- Remove from substrate, check roots for rot. Cut soft parts with a clean knife. Let dry for several days.
- What kills it
- Overwatering, especially in winter or with water-retentive soil.
- Can it be saved?
- Yes, if rot hasn't advanced too much and the apex is healthy. It's a resilient cactus.