Moon Cactus
Gymnocalycium mihanovichii
Also known as: Moon Cactus, Ruby Ball Cactus, Star Flowered Cactus
Cactaceae
Last reviewed: June 2026 · Source: ASPCA Animal Poison Control
A mutant cactus variety lacking chlorophyll, displaying vivid colors of red, orange, yellow, or pink. Grafted onto a green rootstock for survival, it's a popular novelty houseplant.
Toxicity
Source: ASPCA Animal Poison Control Center. Always consult a veterinarian if your pet ingests any plant.
Care Guide
Pot Size
Frequently Asked Questions
Is Moon Cactus toxic to cats?↓
No, Moon Cactus is not toxic to cats and is considered pet-safe according to the ASPCA. It is generally safe to keep in homes with cats.
Is Moon Cactus toxic to dogs?↓
No, Moon Cactus is not toxic to dogs. It is listed as non-toxic by the ASPCA and is safe to have around dogs.
How often should I water Moon Cactus?↓
Water Moon Cactus every 14–21 days. Allow the soil to dry out completely between waterings — this plant is drought-tolerant and prone to root rot if overwatered.
How much light does Moon Cactus need?↓
Moon Cactus thrives in medium indirect light — bright enough to read by, but no direct sun rays. It is forgiving and adapts to a range of light conditions.
What size pot does Moon Cactus need?↓
Use a pot between 2″ and 4″ in diameter. When repotting, choose a pot only 1–2″ larger than the current one — too much space retains excess moisture and can lead to root rot.