Brachycereus nesioticus (K.Schum. ex B.L.Rob.) Backeb.
Brachycereus nesioticus is a clump-forming cactus with cylindrical stems that grows up to 2 feet (60 cm) tall. The stems are yellow with green or brown tones and have 16 to 22 ribs. Each areole has up to 40 spines, initially yellowish, becoming darker with age. The spines are up to 2 inches (5 cm) long. Flowers are narrowly funnel-shaped, with many spines on the lower part, up to 4.4 inches (11 cm) long and up to 2.2 inches (5.5 cm) in diameter. They are white to yellowish-white inside and open in the daytime. Fruits are red to brown, covered with yellow spines, and filled with many black seeds.
USDA hardiness zones 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. Make sure 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. Cutaway the affected parts and replant. Most gardeners interested in cacti should be able to cultivate these without much problem.
It may become necessary to repot your Cereus if it outgrows its container. If so, make sure the soil is dry and then remove the pot. Knock away old soil, prune away any rotted or dead roots, then replace it in a new pot and backfill it with new soil. Ensure not to overwater cacti planted in new pots, as this can lead to root rot. It should be left dry for about a week and then watered lightly.
These cacti propagate quite easily from cuttings. Simply sever a branch and replant in moist, well-drained soil.
See more at How to Grow and Care for Cereus.
This species is endemic to the Galapagos Islands. It is a colonizer of lava fields, hence its common name, forming spiny clumps.
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