Cactus Moon

Gymnocalycium mihanovichii

houseplant

verifiedReviewed by the GreenScout Team

Moon Cactus, also called Chin Cactus, is a small, globe-shaped cactus with smooth, spineless varieties prized for their unusual appearance and manageable size. This slow-growing species thrives indoors and produces delicate pink, yellow, or white flowers in spring. Many cultivars are grafted onto rootstocks to create the distinctive ball-shaped heads.

Common Problems

Select the problem your Cactus Moon is experiencing to get a treatment guide.

shower

Overwateringchevron_right

compost

Root Rotchevron_right

opacity

Mushy Stemschevron_right

hourglass_bottom

Slow Growthchevron_right

trending_down

Wiltingchevron_right

Care Guide

light_mode

Light

Bright, indirect light; prefers 4–6 hours of bright light daily. Can tolerate partial shade better than many cacti.

water_drop

Water

Water moderately during growing season; allow soil surface to dry between waterings. Reduce water significantly in winter.

compost

Soil

Well-draining cactus or succulent mix; ensure excellent drainage.

science

Fertiliser

Apply diluted succulent fertilizer once in spring and once in early summer.

thermometer

Temperature

Prefers 50–75°F (10–24°C); tolerates 40–80°F (4–27°C); avoid prolonged exposure to temperatures below 45°F (7°C).

humidity_percentage

Humidity

Low humidity preferred; excess moisture increases disease risk.

Toxicity

check_circleSafe for Catscheck_circleSafe for Dogscheck_circleSafe for Children

Non-toxic; most varieties are spineless or have very small spines, making them safer for households with children and pets.

Common Diseases

filter_dramaRoot Rotchevron_right grainLeaf Spotchevron_right

Common Pests

coronavirusMealybugschevron_right hiveScale Insectschevron_right pest_controlSpider Miteschevron_right

Seasonal Care

local_floristspring

Resume regular watering and feeding as growth picks up.

light_modesummer

Peak growing season. Water and feed regularly.

ecoautumn

Reduce watering as growth slows. Stop heavy feeding.

ac_unitwinter

Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

Why is the colorful top of my Cactus Moon shrinking or turning green?

Most Moon Cactus specimens are a colorful, chlorophyll-lacking mutant grafted onto a green rootstock. If the graft union weakens or the top reverts, it can start showing green patches — a sign the graft is aging and may eventually need replacing.

Can my Cactus Moon survive without being grafted?

The vivid pink, yellow, or red varieties lack chlorophyll and can't survive long-term on their own roots — they depend on their green rootstock for photosynthesis, so a healthy graft union is essential to its survival.