Astrophytum Myriostigma
The Astrophytum Myriostigma, also known as the “bishop’s cap”, is an elegant and minimalist cactus, instantly recognizable for its lack of spines and star-shaped form. It is one of the most appreciated representatives of its genus among collectors of rare cacti and anyone looking for a graphic, modern, and easy-care plant.
Its silhouette usually consists of 5 vertical ribs (hence its nickname “bishop’s cap”), although some variants may have 4 or 6. It can reach 20–25 cm in height and about 10 cm in diameter, making it perfectly suited for pot cultivation.
One of its main assets is its complete absence of spines, making it visually appealing and easy to handle, even for beginners. Its epidermis is dotted with small white tufts called trichomes, giving the cactus a slightly powdery appearance.
It naturally grows on stony, very well-drained soils under an arid and hot climate. Its ability to adapt to drought makes it an ideal plant for bright indoor environments.
🌞 Direct sunlight: Ideally 5 to 6 hours per day. The stronger the light, the more compact and harmonious the shape.
🌤️ Gradual exposure: Avoid sudden exposure to full sun if the plant was grown in shade, to prevent burns.
🚨 Insufficient light: Lack of light can cause stretching (etiolation) and dull coloration.
🌱 Spring / Summer: Water only when the substrate is fully dry, approximately every 2 to 3 weeks.
🍂 Autumn / Winter: Greatly reduce watering or stop completely during winter.
⚠️ Tip: Use room-temperature water and avoid wetting the cactus body.
🔥 Ideal temperature: Between 22°C and 32°C in summer.
❄️ Cold resistance: Down to 5°C occasionally if kept dry, but never allow frost.
🏡 Wintering: Bring indoors before the first cold spells if grown outside.
🪨 Ideal mix: cactus soil + 50% pumice or pozzolana.
🌱 Repotting: Every 3 to 4 years, in spring.
🎯 Season: From spring to late summer.
🎨 Color: Pale yellow flowers, sometimes with an orange center.
💡 Tip: Good exposure and moderate water stress can encourage flowering.
