Gymnocalycium ritterianum

Origin: Argentina It is a variable small cactus, usually solitary to occasionally clustering. Cultivation: It is a summer grower species that offers no cultivation difficulties. Water regularly in summer (but do not overwater ) Keep this plant almost dry in winter at a minimum temperature of 0°C, prefer relatively rich substrate and low pH compost (if possible not limestone) otherwise growth will stop altogether. Feed with a high potassium fertilizer in summer. It is quite frost resistant if kept dry (hardy to -5° C) Sun Exposure: Light shade. It may tolerate bright situations but is likely to suffer from sun scorch or stunted growth if over exposed to direct sunlight during the hottest part of the day in summer. This plant needs plenty of space for its roots, repotting should be done every other year or when the it has outgrown its pot. Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz