Sulcorebutia rauschii is a well known
clustering species, that readily forms
clumps of many
heads with characteristic short pectinate spines.
The crested form is very rare and nice..
5 cm in width. .The stem is
covered by flat
tubercles (5mm wide) which vary in colour between dark green and
Areoles : Long
narrow with short white
9-11 short black
radial spines, 1 to 2 mm long, pointing diagonally and downward,
completely flattened against the
tubercles, they take the characteristic form of a fishbone.
20 - 50 mm long, 35 - 50 mm wide;
funnel-shaped yellowish green with tan coloured
scales, tepals deep magenta with a clearer
Very difficult to find high quality plants of this species in
cultivation, S. rauschii loves a very
mineral soil as well as to be strictly
kept dry throughout the
winter quiescent period since it is very
sensitive to any
moisture excesses, To prevent
rottenness it is also advisable to surround its
root neck by very rough
grit, this help a fast water
drainage and an appropriate
sensitive roots this species is frequently
grafted to avoid root problems.
Water moderately in the
growing season, keep
dry during the
winter rest. Needs a full sun,
or half shaded exposure (light shadow my be useful in the
hottest summer days)
Propagation: Grafting since cutting root hardly.
cause of cresting: The cause of cresting is not fully explained, biologists
disagree as to why some cacti grow in this unusual form. Some
speculate that it is a genetic mutation. Others say it is the result of
a lightning strike or freeze damage, but whatever the stimulus, the
growth point of the stem has switched from a geometric point, to a line,
which folds and undulates as the crest expands. Crested Yavia are very rare, cresting occurs naturally and can be encountered in many
other cactus species.