Native to the Atacama desert of northern Chile, Copiapoa includes 26 species of clumping globular cacti. They inhabit a dry coastal desert that rarely receives rain. To counter this they have evolved a mechanism to absorb moisture from fog and occasional dew. Older specimens are covered by a waxy powdery grey coating and grow slightly columnar in time. Most species have wooly areoles and eventually develop a wooly sort of cephalium from which yellow flowers are born in spring and summer.
    Copiapoas should be grown in a fast draining mineral rich mix and watered moderately through the growing season. Care should be taken in watering as the waxy white coating can be washed off. In winter water sparingly and keep the plant warm. They are prone to rot at this time. They like light shade and can burn in direct sun. Copiapoas can be propagated by seed or with most species, offsets that grow from the ribs of the plant.

I have 4 Copiapoas in my collection. Click below.
Copiapoa cinerea	Copiapoa echinoides var. dura	Copiapoa haseltoniana	Copiapoa esmeraldana
Copiapoa humilis