How to Fertilize chin cactus?
Very weak cactus fertilizer monthly during warm active growth

chin cactus · Gymnocalycium andreae
Grow in full sun, in a standard cactus compost or a well drained loam based compost: (JI No1) with the addition of extra grit. Water freely when in active growth from March to September. Keep dry in the winter.
Very weak cactus fertilizer monthly during warm active growth