Publication: n.n. (Orthographic variant “sulfurea”)
Description
Clumping short cactus
Stem: At first globular, becoming shortly columnar up to 45 cm tall, 10 cm in diameter.
Spines: Dense amber-yellow, the new spines are orangish.
Flower: Diurnal, opening in during the day and closing at night. Yellow with red pistil, 4cm in diameter.
Cultivation and Propagation
It is easy to grow. It prefers a neutral to slightly acidic mineral-based potting mix with plenty of extra grit and feed during the summer. It likes a warm bright location, does great in partial shade but doesn’t like full, hot blazing sun in the central summer month. Can support quite some water during the growing season but pot plants in winter are wet-sensitive and needs to be kept dry (rots easily if soil is wet and cold) tends to lose its roots in winter. Water Best if watered with rain water. Usually it is recommended to over-winter this plant in a bright and warm greenhouse with at least 8-10° C and rather dry (it tends to lose its roots and to rot if the substrate is wet and cold) but it has proved to tolerate temperatures as low as -5° C for short periods. It is susceptible to spider mites, so it should be check once in a while for it.
Propagation: Seeds, cuttings or root suckers (if available). Not too difficult to raise from seed.
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