Acanthocalycium sp P91 Sierra Tulumba, nord Cordoba, Argentina
Description: Solitary to slowly clumping.
Stem: Globular to elongate up to 60 cm tall, 15 cm in diameter.
Ribs: Numerous 16 to 20 acute;
Spines: 10 to 20 per areole, dense, thin, long, curved greyish-pink or greyish-honey-coloured.
Flowers: A. spiniflorus flowers range from pink to white (4 cm to 7,5 cm in diameter) appear during late spring and summer, the form “violaciflorus” has lilac flowers. It starts blooming at around 6cm in diameter.
Cultivation: It is a summer-growing species that offers no cultivation difficulty. Water regularly in summer (but do not over-water). It needs good drainage and very porous soil. Keep rather dry in winter. Feed with a high potassium fertilizer in summer. It is quite frost resistant if kept dry (hardy to -12° C). It needs a very bright exposure. Full sun is indispensable to keep plant compact with strong spines.
Propagation: Direct sow after last frost, offsets (if available).
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