The top cactus of the moon cactus has a mutation that causes it to lack the chlorophyll that makes the cactus green. This mutation exposes the red, orange or yellow color beneath. Cactus that lack chlorophyll cannot live on their own
Like most cacti they're drought tolerant and need very little care and attention to grow well. Not enough sunlight and over-watering are common mistakes.
The moon cactus plant requires bright indirect sunlight. Full sun will actually harm this container plant, so keep it out of direct sunlight for long periods of time.
It is an excellent plant for garden rockery settings, desert type landscapes, patios and botanical gardens