Neowerdermannia vorwerkii Frič
Sulcorebutia vorwerkii, Weingartia vorwerkii
Neowerdermannia vorwerkii is a cactus with a solitary flattened stem that becomes globular-elongate in cultivation. The stem is pale green or dark green and grows up to 4 inches (10 cm) in diameter. It has 16 or more ribs, up to 10 curved radial spines, and 1 to 3, often hooked central spines per areole. The spines are whitish, brownish to grayish, and up to 1.6 inches (4 cm) long. Flowers are white or pale pink, funnel-shaped, up to 8 inches (20 cm) in diameter, and appear in spring. Fruits are green, becoming reddish, globose, and up to 0.3 inches (0.8 cm) in diameter.
USDA hardiness zone 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Neowerdermannias come from mountainous areas, so like bright light, cool and dry conditions in the winter, this is important for the flowers and their health. Without this cool winter period of 32 to 50 °F (0 to 10 °C), they usually won't get many buds. They have a thick taproot and are of difficult cultivation and rot prone because of great sensitivity to the excess of watering, not easy to get to any large size on their own roots, really a challenge to grow into a large clump. It needs a deep pot and good drainage to accommodate its taproot.
They are commonly grafted to avoid root problems and to make them easier to grow. On a graft, Neowerdermannias are easier to grow, but the body splits if over-watered (especially in spring). See more at How to Grow and Care for Neowerdermannia.
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