They flower from spring to fall, and handle full sun to full
shade, also the spines are nearly useless in terms of defense so a pretty
Gymnocalycium rotundulum (G. damsii
var. rotundulum) is a usually solitary colourful cactus,
characterized by rounder and scarcely raised tubercles.
But it is very similar (if not identical) to the standard G.
damsii and it is is probably the exact same plant.
Stem: Up to 10 cm tall , 8-10 cm in diameter colourful and
highly decorative, with characteristic horizontal clear and dark
strips. The clear areas (above the areoles) are
pastel-grey-pink while the dark zone (below the areoles) are deep
olive-green to brown-purple.
Spines: Nearly useless in terms of defence.
Remarks: Seems to be a pretty
variable plant you might get some other names which are effectively the
same plant.... and also not sure all plants identified as this are
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
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
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. This species is particularly
easy and accommodating, seldom suffer of
Propagation: Direct sow after
last frost. (seldom