Jasminocereus thouarsii (F. A. C. Weber) Backeb.
Cereus thouarsi, Jasminocereus thouarsii var. thouarsii, Jasminocereus howellii, Cereus sclerocarpus, Brachycereus thouarsii, Cereus galapagensis, Jasminocereus galapagensis, Jasminocereus sclerocarpus
Jasminocereus thouarsii is a tree-like cactus with a thick green or greenish-yellow stem that usually separates into several branches. It grows up to 16.4 feet (5 m) tall. The trunk and brunches have 11 to 22 ribs and bear clusters of up to 35 spines that vary in color from white and yellow to reddish-brown or black. The spines are up to 3.6 inches (9 cm) long. Flowers are up to 2.4 inches (6 cm) in diameter, open at night, and have white, yellow, or olive green petals. Fruits are greenish to reddish-purple berries that contain many black seeds.
USDA hardiness zone 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Like most cacti, Cereus are fairly low-maintenance and hardy. Ensure they receive enough water without becoming waterlogged, especially during the summer, and fertilize them for the best results. If the roots have become black or overly soft, the cactus could be experiencing root rot – cut away the affected parts and replant. Like all cacti, give them lots of direct sunlight, especially during the summer. Well-drained soil is best, and most Cereus plants perform well in soil that contains some organic material. Some recommend avoiding soil that contains sphagnum moss, though – it can make the cactus vulnerable to root rot.
Cereus cacti propagate quite easily from cuttings. Simply sever a branch and replant in moist, well-drained soil. It helps to allow the cut end to dry out and harden before you replant it. This makes it easier for the new cactus to form roots.
See more at How to Grow and Care for Cereus.
This species is native to Ecuador (Galapagos Islands). It occurs in arid areas on the islands of Floreana, Isabela, San Cristóbal and Santa Cruz.
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