Rebutia canigueralii subs. rauschii
Sulcorebutia rauschii is a well known miniature clustering species, that readily forms clumps of many heads with characteristic short pectinate spines. The crested form is very rare and nice.
Stems are up to 5 cm in width. .The stem is covered by flat tubercles (5mm wide) which vary in colour between dark green and violet. Flowers are 20 - 50 mm long, 35 - 50 mm wide; floral tube funnel-shaped yellowish green with tan coloured scales, tepals deep magenta with a clearer throat.
Sulcorebutia is a mountainous cactus with a thick taproots and is susceptible to overwatering, it grows rather slowly and need a very good drainage to avoid rotting. It requires also an appropriate air circulation and is sometime grafted to avoid root problems.It loves a very permeable, coarse mineral soil. Water moderately in the growing season, keep dry during the winter rest. Needs a full sun, or half shaded exposure (light shadow may be useful in the hottest summer days)
Give an occasional high potassium liquid feed during the active growing period.
It is a fine plant for a rock garden or container, contrasts well with agaves, yuccas, and low-growing flowering Cactus.