This genus of perennial cactus form a spherical to cylindrical habit with parallel or spiralling ribs that are separated by diagonal grooves. The areoles produce sparsely, slightly curved spines and the pink to yellow funnel-shaped flowers appear in summer.

Hardiness zones 9 to 11

Gymnocalycium species is naturally found in South America growing in well drained moderatly fertile gritty light soils in an open sunny position and are frost tender but drought tolerant.

This genus of cactus are grown in small or arid gardens as a specimen or in rockeries and are excellent flowering indoor plants. These plants are also suitable for roof gardens or sunny courtyards. They are slow growing and should not be watered during winter and if the temperatures fall below 16º C, they should be place in glasshouse or protected area. ID 686

Gymnocalycium (gim-nō-ka-LI-kee-um) species 

Cactaceae (kak-TAY-see-ee)