Turbinicarpus subterraneus (Backeb.) A. D. Zimm.
Echinocactus subterraneus (basionym), Gymnocactus subterraneus, Neolloydia subterranea, Rapicactus subterraneus, Thelocactus subterraneus
Turbinicarpus subterraneus is one of the most fascinating and unusual cacti. It is usually solitary, club-shaped, up to 6 inches (15 cm) tall, up to 1.2 inches (3 cm) in diameter and green-bluish in color. The stem is typically prostrate, flaring out after a very long slender neck that separates the large tuberose root from the enlarged apical part of the plant. The flowers are whitish to pinkish-magenta with pink or brown midstripe, up to 1 inch (2.5 cm) long and up to 1.2 inches (3 cm) in diameter. The fruits are small, greenish-brown, relatively dry and unattractive.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
Turbinicarpus prefer to be in a well ventilated position in full sun to maintain a good body color and spinal development. The golden rule when it comes to watering is "never water when the compost is still damp". This is the one error that will certainly kill any plant. Watering should commence in the spring depending upon the weather conditions at the time. The plants should initially be given a light spray to gently encourage them into growth.
These cacti are all able to withstand high summer temperatures and indeed benefit, providing accompanied by good ventilation. Do not be tempted to overcrowd the plants, they will be far happier with a little space to allow the air to circulate. Winter temperatures can be set as low at 44 to 46 °F (7 to 8 °C) and providing the plants are kept dry and the humidity levels are also kept low, by good ventilation on bright days… – See more at: How to Grow and Care for Turbinicarpus
Turbinicarpus subterraneus is endemic to Mexico. Its natural habitat is hot deserts.
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