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Astrophytum myriostigma Care Sheet

Common Names:

  • Bishop's Cap Cactus, Bishop's Hat

Scientific Name:

  • Astrophytum myriostigma


Astrophytum myriostigma is a small, globular cactus known for its distinctive ribbed pattern and woolly areoles. The cactus is typically green to dark green in color, sometimes with a hint of reddish-brown at the top. It develops star-shaped yellow flowers with orange centers during the spring and summer months.

Light Requirements:

  • Indoors: Place in a bright, sunny location near a south or east-facing window where it can receive at least 4-6 hours of direct sunlight daily.
  • Outdoors: Thrives in full sun to partial shade. Protect from intense afternoon sun in hot climates to prevent sunburn.


  • Ideal Range: 70-85°F (21-29°C) during the active growing season.
  • Winter Care: In winter, the plant prefers cooler temperatures around 50-60°F (10-15°C) to promote flowering. Protect from frost.


  • Watering Frequency: Water thoroughly when the top inch (2.5 cm) of soil is dry during the active growing season (spring to early fall).
  • Winter Watering: Reduce watering in winter to prevent root rot. Allow the soil to dry out more between waterings.


  • Humidity Tolerance: Prefers low humidity environments. Ensure good air circulation to prevent fungal issues.


  • Preferred Soil: Well-draining cactus or succulent mix. Add extra pumice, perlite, or coarse sand to enhance drainage.


  • Fertilizer Type: Use a balanced, water-soluble fertilizer diluted to half-strength.
  • Fertilizing Schedule: Apply fertilizer monthly during the growing season (spring and summer). Avoid fertilizing in winter.

Potting and Repotting:

  • Repotting Frequency: Repot every 2-3 years in spring to refresh the soil and provide more space for growth.
  • Container Type: Use a pot with drainage holes to prevent waterlogging.

Pruning and Maintenance:

  • Pruning Needs: Minimal pruning required. Remove dead or damaged parts with a clean, sharp tool.
  • Propagation: Propagate from seeds or offsets produced at the base of the plant. Allow cuttings to callous before planting in well-draining soil.

Pests and Problems:

  • Common Pests: Watch for spider mites and scale insects. Treat with insecticidal soap or neem oil if infestations occur.
  • Issues: Overwatering can lead to root rot. Ensure pots have drainage holes and avoid leaving water in saucers.

Tips for Success:

  • Provide ample sunlight, especially during the growing season, to maintain compact growth and prevent etiolation.
  • Protect from extreme temperatures and sudden temperature fluctuations.
  • Handle the cactus carefully to avoid damaging the delicate spines and woolly areoles.


Astrophytum myriostigma, or Bishop's Cap Cactus, is a unique and attractive addition to any succulent collection. With its distinctive appearance and relatively low maintenance requirements, it thrives when provided with bright light, well-draining soil, and careful watering practices. Enjoy its occasional yellow blooms as a reward for proper care.


Following these care guidelines will help ensure your Astrophytum myriostigma remains healthy and vibrant, showcasing its characteristic beauty in your home or garden.

Astrophytum myriostigma

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