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Neowerdermannia vorwerkii (Achacana)


Scientific Name

Neowerdermannia vorwerkii Frič

Common Names

Achacana (Spanish)


Sulcorebutia vorwerkii, Weingartia vorwerkii

Scientific Classification

Family: Cactaceae
Subfamily: Cactoideae
Tribe: Notocacteae
Genus: Neowerdermannia


Neowerdermannia vorwerkii is a solitary, flattened cactus (becoming globular-elongate in cultivation), pale green or dark green in color and up to 4 inches (10 cm) in diameter, with 16 or more 3-sided ribs, up to 10, spreading star-like, curved radial spines, up to 0.7 inch (1.8 cm) and 1 to 3, often hooked central spines, up to 0.8 inch (2 cm) long. The flowers are funnel-shaped, white or pale pink in color and up to 8 inches (20 cm) in diameter. The fruits is globose, green, becoming reddish and up to 0.3 inch (8 mm) in diameter.

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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 as well as for their health. Without this cool winter period 32 to 50 °F (0 to 10 °C) they normally won't get many buds. They have a thick taproot and are of difficult cultivation and rot prone because of a 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. Needs deep pot and good drainage to accommodate its tap root.

They are commonly grafted to avoid root problems and to make 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


Native to Argentina (Jujuy, Salta) and Bolivia.


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