Rebutia steinbachii subsp. verticillacantha (F. Ritter) D.R. Hunt
Sulcorebutia steinbachii subsp. verticillacantha, Sulcorebutia verticillacantha, Weingartia steinbachii subsp. verticillacantha, Weingartia verticillacantha
Rebutia steinbachii subsp. verticillacantha, formerly known as Sulcorebutia verticillacantha, is a small, clump-forming cactus with spherical stems with rhomboid tubercles spirally arranged in 13 to 21 ribs and topped with narrow areoles that bear pectinate spines. The stems grow up to 1.4 inches (3.5 cm) in diameter. They are grey-green to dark olive green, often red-tinged when grown in full sun. The areoles are white or yellowish and up to 0.25 inches (0.6 cm) long. Each areole bears 6 to 14 cream-colored or yellowish, up to 0.2 inches (0.5 cm) long radial spines. Central spines are absent.
The flowers appear in a ring at the base of the stems, brightening the plant in spring. They are usually light purple flowers with a contrasting yellow-orange throat.
Rebutia steinbachii subsp. verticillacantha is native to Bolivia. It grows on hillsides and rocky outcrops near Arque in the Cochabamba Department at elevations that range from 9,510 to 12,800 feet (2,900 to 3,900 m).
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
If you can grow cacti and succulents successfully, you can likely grow the popular Rebutias without too much trouble. Their water and light requirements are fairly typical for many cacti species, including a cooling period in the winter to promote better blooming. Watering should be done carefully, allowing the plant to almost dry out between waterings. The cactus mustn't be exposed to prolonged dampness and sitting water. Never let your cactus sit in a dish of water. Instead of propagating your offsets, let the plant form a large cluster for the best viewing. When it blooms, this will make a stunning display. Lastly, ensure fertilizer during the growing season for the best results.
Repot as needed, preferably during the warm season. To repot your Rebutia, ensure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, removing any rotted or dead roots. Treat any cuts with a fungicide. Place the plant in its new pot and backfill it with potting soil, spreading the roots out as you repot. Leave the plant dry for a week or so, then begin to water lightly to reduce the risk of root rot.
Learn more at How to Grow and Care for Rebutia.
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