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Neowerdermannia vorwerkii (Achacana)

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Scientific Name

Neowerdermannia vorwerkii Frič

Common Names

Achacana (Spanish)

Synonyms

Sulcorebutia vorwerkii, Weingartia vorwerkii

Scientific Classification

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

Description

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.

Photo via fotki.com

Hardiness

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

Origin

Native to Argentina (Jujuy, Salta) and Bolivia.

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