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Gymnocalycium mihanovichii
Also called Red Cap
Gymnocalycium mihanovichii is a small, globe-shaped cactus from Paraguay and Argentina, and the colourful 'moon cactus' sold as a houseplant is usually a chlorophyll-free mutant grafted onto a fast-growing Hylocereus rootstock. Grow it in bright indirect light with well-drained soil and water only when the mix is nearly dry.
Gymnocalycium mihanovichii is a species of cactus from South America.
The most popular cultivars are varied mutants which completely lack chlorophyll, exposing the pink, red, orange, or yellow pigmentation; coming from the betalains in the plant becoming exposed.
A number of Gymnocalyciums prefer shade in the wild, being cloaked under shrubs or grasses, while others prefer abundant sunlight. Moon cactus, for one, thrives best in bright, indirect light, and can be grown indoors year round. Those preferring plentiful sunshine may need covering from the sun in the hottest months, but exaggerating this will result in loss of flowers. The balance of the potting medium should be adequate to allow decent drainage so that the plants do not sit in marshy soil for more than a day or two after watering. During the summer months, the plant may need frequent watering, though those in small pots would need weekly watering. Nevertheless, the compost should be virtually dry before re-watering. Watering in the winter months is unnecessary.
Gymnocalycium baldianum · Gymnocalycium gibbosum · Cactus · Gymnocalycium quehlianum · Gymnocalycium saglionis · Gymnocalycium
Text excerpted from the Wikipedia article Gymnocalycium mihanovichii by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
