Astrophytum myriostigma - Bishop's Cap Cactus

This distinctive succulent has drawn comparisons to celestial objects and religious headwear, but it really shines as a houseplant whether you think of stars or hats when you see it. Its unique shape is a little like the Bishop's mitre, and from above it resembles a five-pointed star. Its deep, almost silver-green colour comes from the many tiny white dots across it, drawing another comparison to the night sky. But what really makes this stand out from other cacti is its lack of spines - so you can get close without fear of being spiked! This low-maintenance plant makes a fantastic addition to any collection, bringing a touch of the desert to your indoor space.

Scientific Name
Astrophytum myriostigma (star plant with many spots)

Synonyms
Echinocactus myriostigma

While it has been referred to by other names in various scientific papers, the current name, Astrophytum myriostigma, has been accepted since it was first published in 1839.

Common Name(s)
Bishop’s Cap Cactus, Bishop's Hat, Bishop's Mitre, Monk's Hood, Deacon's Hat, Star Cactus

Origin
Native to Centreal America (Northeastern Mexico, specifically found in the rocky upland regions of San Luis Potosí and Coahuila)

Light
Give this cactus a few hours of direct sun, but be careful as too much can cause scorching! East- or west-facing sun will give it a good amount of light without being too strong.

Water
Allow the soil to dry out completely between waterings. Water sparingly, especially during the winter months when the plant is dormant. Overwatering can lead to root rot, a common issue with cacti.

Humidity
Prefers low humidity levels typical of desert environments. Avoid placing it in overly humid areas, as this can encourage fungal growth.

Soil
Use a well-draining soil mix designed for cacti and succulents; a mix with added grit and sand should work well. Repot every few years as the plant grows; you'll know it's ready when the roots have totally crowded out the pot.

Food
Feed every four to six weeks during the growing season (spring and summer) with a diluted, balanced fertiliser. No feeding needed during the dormant winter months.

Temperature
Enjoys warm temperatures between 18-30°C. Protect from frost and temperatures below 10°C; this plant can be sensitive to cold draughts.

Pet Safety
Yes, this plant is non-toxic to pets, making it a safe choice for households with furry friends.

Sprouts Top Tips
Watch for signs of overwatering, such as yellowing or mushy stems. If you notice these symptoms, reduce watering frequency. When repotting, choose a slightly larger pot to allow for growth, and avoid using a pot without drainage holes.

Extras
Astrophytum myriostigma can produce beautiful yellow flowers when mature, adding an extra touch of charm to your collection.

Did You Know?
This species is often referred to as 'Bishop’s Cap' due to its distinctive shape that resembles a bishop’s mitre. It’s also a popular choice for grafting onto other cacti to enhance growth and flowering.