Moon Cactus
Gymnocalycium mihanovichii
The Moon Cactus is a striking, grafted succulent known for its neon-colored, globe-shaped top. Because the colorful upper portion (the scion) lacks chlorophyll, it cannot survive on its own and is grafted onto a hardy green cactus, typically a Hylocereus, which provides the necessary nutrients through photosynthesis. This unique pairing creates a vibrant, two-toned plant that is a favorite for indoor collections and small spaces.
Light
Bright Indirect
Water
Low
Difficulty
Easy
Humidity
Low
Pet Friendly
The Moon Cactus is non-toxic to cats and dogs, though its sharp spines can cause physical injury if the plant is handled or consumed.
Care Guide
Moon Cactus Care Guide Light: Place the cactus in a spot with bright, indirect sunlight. Avoid direct, intense midday sun, as the colorful top is sensitive and can easily scorch. Watering: Follow the 'soak and dry' method. Allow the potting medium to dry out completely before watering thoroughly. In winter, reduce watering to once every 4-6 weeks. Soil: Use a well-draining cactus or succulent mix containing perlite, pumice, or sand to prevent root rot. Temperature: Keep the plant in temperatures between 60°F and 85°F. Protect it from frost and cold drafts. Maintenance: Note that the grafted top and the bottom rootstock grow at different rates. The graft point may weaken after 2-4 years, at which point the top may need to be re-grafted onto a new host cactus to survive.
In-Depth Care & Growth
Feeding & Soil
Fertilizer
Balanced liquid cactus fertilizer
Soil
Gritty, well-draining cactus potting mix
Physical Attributes
Mature Size
4-6 inches tall
Growth Rate
Slow
Propagation
Grafting offsets (pups) onto a new rootstock