Photo: Romi Galeota LencinaCC BY 4.0via iNaturalistresized / cropped
Moon Cactus Plant Care
Gymnocalycium mihanovichii (Frič & Gürke) Britton & Rose
Updated · Sources · How we source care data
Gymnocalycium mihanovichii is a unique cactus known for its flattened, disk-like stems that come in various shades of green, pink, and red. Its eye-catching appearance and compact growth habit make it a popular choice among plant enthusiasts.nativeTo: Argentina
Every 7–14 days
Full sun
60°F
30–50%
At a glance
How do you care for Moon Cactus?
Water Moon Cactus every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 60°F (16°C) and above and 30–50% humidity. Fertilize it every month during the growing season.
Where Is the Moon Cactus Native To?
What Is the Moon Cactus?
Moon Cactus (Gymnocalycium mihanovichii) belongs to the Cactaceae family within the Gymnocalycium genus. Moon Cactus is native to Argentina. Moon Cactus is also known as Chin Cactus, Ruby Ball Cactus, Halloween Cactus.
Moon Cactus displays a low clumping cactus growth habit, reaching up to tall with a spread of approximately 1 ft. Moon Cactus produces brightly colored funnel-shaped flowers in various hues.
How Often Should You Water a Moon Cactus?
Gymnocalycium mihanovichii requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Moon Cactus Need?
Moon Cactus thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Moon Cactus Prefer?
Gymnocalycium mihanovichii grows best at temperatures of 60°F. Moon Cactus prefers humidity levels of 30–50%.
Temperature
60°F
Humidity
30–50%
What Soil Mix Works Best for a Moon Cactus?
Sandy, well-draining cactus mix with perlite and coarse sand. Good drainage is essential for Moon Cactus to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Moon Cactus?
Feed Moon Cactus every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Moon Cactus?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Moon Cactus?
Moon Cactus can be propagated through offsets, seeds.
Is the Moon Cactus Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Moon Cactus, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Moon Cactus?
Moon Cactus is susceptible to spider mites, mealybugs. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Moon Cactus Need?
Moon Cactus grows outdoors in USDA Zone 9b – 11b. It survives winters down to planting zone 9b. Moon Cactus is native to Argentina. In cooler regions, grow Moon Cactus as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 9b – 11b
Keep exploring plants
Moon Cactus is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Gymnocalycium genus — compare its care with other Gymnocalycium species on PlantoScan.
Gymnocalycium is part of the Cactaceae plant family — browse all Cactaceae genera and species.
Moon Cactus thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Gymnocalycium mihanovichii (Frič & Gürke) Britton & Rose, family Cactaceae (first published in Cactaceae 3: 153–154, f. 159. 1922.) — World Flora Online record, Wikidata.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Moon Cactus, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Romi Galeota Lencina, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 9b – 11b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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