G. occultum (= G. stellatum) is a
beautiful, slowly-growing plant with a noticeably flatten
body, at first
solitary, later clustering.
Stem: Dark grayish-brown to olive-coloured epidermis, flattened
globose, 7.5-10 cm in diameter.
offset after a considerable period of time.
Ribs: 7-11, flat,
round, without prominent chin-like protrusions.
Spines: 3-5, dark brown, becoming grey with age, spider-like,
short, straight to slightly curved and flattened against the stem
(rarely sticking out - easy cactus to handle)
Flowers: Creamy-white with a dull red
throat, up to
6,5 cm. long, 4.5
Blooming season: Flowers are produced in late spring and remain
open for up to twelve days.
subspecies, varieties and forms:
subspecies occurs in Catamarca.
“stellatum” subspecies occurs in Cordoba.
Gymnocalycium is supposed to be one of the most
difficult species in cultivation, and very slow
to get to a reasonable size. It will offset after
a considerable period of time.
It is a summer-growing
species that needs
regular water in summer (but do not over-water). Keep rather dry in
plant does not like extremely bright situations. Give it some shade
during the hottest part of the day. Keep this
plant in a low PH compost; otherwise growth will
with a high potassium fertilizer in summer.
It is quite frost resistant if kept dry
(hardy to -5° C)
Propagation: Direct sow after
last frost.(seldom produces