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Bristle Haworthia (Haworthia cooperi)

Haworthia cooperi is an evergreen perennial succulent with a stemless, low-growing, clumping rosette habit, often producing offsets from the base.

LightHaworthia cooperi is suited to bright light or part shade, with bright filtered or diffuse light described as suitable and lower indoor light also tolerated. Sources differ because some also indicate full sun, while stro
WaterDuring active growth, water thoroughly after the growing medium dries and ensure drainage; reduce watering during hot summer dormancy or near-dormancy and during cold winter conditions, avoiding prolonged wetness around
HumidityHaworthia cooperi is generally reported to prefer low humidity.
TemperatureThe stated minimum temperature is 5 °C, and Haworthia cooperi is generally reported to be frost tender and should be kept above freezing. It rests in summer. Sources differ in their hardiness classifications, with one us
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Bristle Haworthia illustration

Overview

Haworthia cooperi is an evergreen perennial succulent with a stemless, low-growing, clumping rosette habit, often producing offsets from the base.

Origin and habitat

Haworthia cooperi is native to South Africa's Eastern Cape, around the area from Port Elizabeth to East London. It occurs on lowland plains, where plants are often buried in soil or sand with mainly their transparent leaf tips exposed at the surface; it is also reported from higher elevations. Its native habitat is reported to lie in a summer-rainfall region.

Characteristics

Sources are few regarding mature height, which is reported at about 0–10 cm, while sources differ on mature spread, reported at about 0–10 cm. It grows slowly and stores water in its leaves; its fleshy leaves range from elongate-oval to lance-shaped and from pale green to gray-green or blue-green, with a plump, somewhat translucent appearance, transparent windows and longitudinal markings at the tips, while tip shape and the presence of awns or fine teeth vary, and stronger light may cause reddish to purple coloration. The small white to nearly white flowers are borne in racemes on slender stalks; sources differ on flowering timing, describing it from spring into summer and giving a native-habitat flowering period extending from late in one year into early in the next. The fruit is generally reported to have the typical characteristics of the genus Haworthia.

Light

Haworthia cooperi is suited to bright light or part shade, with bright filtered or diffuse light described as suitable and lower indoor light also tolerated. Sources differ because some also indicate full sun, while strong direct light may slow growth, reduce the leaves' plump appearance, or turn them red, so excessive exposure in hot conditions is best avoided.

Watering

During active growth, water thoroughly after the growing medium dries and ensure drainage; reduce watering during hot summer dormancy or near-dormancy and during cold winter conditions, avoiding prolonged wetness around the roots. A single source reports a summer watering interval of about 14–21 days, so sources are few for this range.

Humidity and airflow

Haworthia cooperi is generally reported to prefer low humidity.

Temperature and dormancy

The stated minimum temperature is 5 °C, and Haworthia cooperi is generally reported to be frost tender and should be kept above freezing. It rests in summer. Sources differ in their hardiness classifications, with one using an RHS classification and genus-level information elsewhere using a USDA classification. Strong direct sunlight may slow growth, reduce the leaves' plump appearance, and cause red coloration.

Growing medium and mounting

Use a well-drained succulent or cactus growing medium; sandy or loamy material can be supplemented with granular material, and containers should have drainage holes. Haworthia cooperi needs a fast-draining mix and is prone to rot.

Feeding

Feed lightly during active growth; sources describe diluted low-nitrogen fertilizer in the later part of spring through summer or small amounts of slow-release chemical fertilizer or liquid fertilizer during spring and autumn growth, while fertilizer should be avoided during summer dormancy.

Propagation

Haworthia cooperi can be propagated from offsets, by division, and from seed; genus-level horticultural information also describes leaf cuttings and, for some kinds, root cuttings.

Common problems

Mealybugs may affect Haworthia cooperi, while genus-level information also lists scale insects, aphids, root mealybugs, and fungus gnats. Obvious disease problems are generally uncommon, but persistently wet growing medium in summer or winter may cause root rot, and excessive watering or feeding during summer dormancy can impair growth. Excessively strong sunlight can redden leaves, reduce their plump appearance, and may injure them. Cold tolerance is limited, while plants may become dormant in intense summer heat; hot conditions combined with overly wet growing medium carry greater risk, and strong direct sunlight may also stress the plant.

Identification

A key feature is the transparent to translucent window tissue at the tips of the fleshy leaves; in the wild, much of the leaf may be buried in soil or sand, leaving the transparent tips near the surface to admit light. Most varieties have fine bristles or awns along the leaf margins, although the varieties differ greatly.

Photos

Haworthia cooperi
📷 Abu Shawka · CC0 · source
Haworthia cooperi
📷 Nicola van Berkel, some rights reserved (CC BY-SA), uploaded · CC BY-SA · source
Haworthia cooperi
📷 Nicola van Berkel, some rights reserved (CC BY-SA), uploaded · CC BY-SA · source

Sources