The vast array of sizes, textures, colors, and shapes of cacti and succulents provides nearly endless diversity for the succulent collector. Moon cactus plants are known as Gymnocalycium mihanovichii or Hibotan cactus. Strangely, the plant is something of a mutant and lacks the ability to produce chlorophyll, which means it must be grafted onto a rootstock with that ability.

Read more at Gardening Know How: Moon Cactus Info: Learn About The Care Of Moon Cactus https://www.gardeningknowhow.com/ornamental/cacti-succulents/moon-cactus/care-of-moon-cactus.htm