Astrophytum Myriostigma commonly known as bishops hat / bishops cap. This is the reverse order of the cactus flower. Like other star cactus, does not require much water. They demand fast drainage overall and are downright hard to kill except with excessive moisture and rich soils. Very slow growth. An ideal choice for beginners to take care of this type of cactus due to its lack of thorns, exceptional geometry and ease of cultivation indoors.