If moon cactus has no chlorophyll and can't survive on its own without being grafted to a host cactus, then how did it survive in the wild and grow old enough to reproduce?
Origin of Moon Cactus
Certified GKH Gardening Expert
Since there are over 80 known species of Moon Cactus, there's a good chance they all came from a far fewer number of specimens that, over time, naturally grafted to other chlorophyll-producing plants, and among themselves, in the wild.
If you have a Moon Cactus or are considering getting one, this article contains information on their care: