Haworthiopsis nigra (Haw.) G.D.Rowley
Aloe nigra, Apicra nigra, Catevala nigra, Haworthia nigra, Haworthia nigra var. nigra, Haworthia venosa subsp. nigra, Haworthia viscosa subsp. nigra, Haworthiopsis nigra var. nigra
This species is native to South Africa. It occurs from near East London in the southeast to the north of Loeriesfontein in the northwest, growing hidden under rocks and bushes on plains, rocky ridges, rocky outcrops, and cliffs.
Haworthiopsis nigra, formerly known as Haworthia nigra, is a small succulent with blackish to grey-green leathery leaves with many raised tubercles. It grows to 5 inches (5 cm) tall, occasionally taller, slowly producing offsets to form small clumps. Leaves are ovate-deltoid, up to 1.2 inches (3 cm) long and up to 0.6 inches (1.5 cm) wide. They may be recurved and elongated away from the stem or short and compressed upon one another. Each new leaf emerges from the center atop the one below it, lending plants a stacked or tiered look. Overall, the foliage remains dark green with varying grades of gray to black. In late spring or summer, mature rosettes produce simple, lax stalks with small white flowers.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
These succulents are not considered difficult houseplants to grow. If you can keep a pot of Aloe alive on a windowsill, you can do the same with a dish of Haworthia. As with all succulents, the most dangerous situation is too much water. They should never be allowed to sit in water under any circumstances. At the same time, these little decorative plants can be grown in interesting containers such as teacups and even miniature baby shoes. If you're given a Haworthia in such a container, ensure the container has adequate drainage.
Haworthias are small, usually between 3 and 5 inches (7.5 cm and 12.5 cm) in height, and relatively slow-growing. Therefore, they are often grown in small clusters in wide shallow dishes. Over time, clusters will naturally enlarge as the mother plant sends off small plantlets. When the cluster has outgrown its container, repot into a new wide and shallow container with fresh potting soil in the spring or early summer. This is also the time to take offsets for propagation.
See more at How to Grow and Care for Haworthia.
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