Synonyms:

Haworthia attenuata var. radula is actually a synonym of Haworthiopsis attenuata var. radula. Other synonyms are:

Aloe radula
Aloe radula var. major
Aloe radula var. media
Aloe radula var. minor
Aloe rugosa
Aloe rugosa var. perviridis
Apicra radula
Catevala radula
Catevala rugosa
Haworthia attenuata var. radula
Haworthia pumila subsp. radula
Haworthia radula
Haworthia radula var. laevior
Haworthia rugosa
Haworthia rugosa var. perviridis

Habitat:

Haworthia attenuata var. radula is native to a limited region surrounding Hankey, situated in the Eastern Cape Province of South Africa. Within this area, it is found growing alongside other succulent species such as Haworthia attenuata, Haworthia gracilis, Gasteria pulchra, and Aloe humilis.
Tragically, the natural habitat of these plants has faced significant degradation primarily due to agricultural activities. The once-thriving population of these succulents has been severely impacted, with large portions of their habitat destroyed. In particular, a five-mile strip along the road where these plants once flourished has been cleared by bulldozers, leaving the land barren and devoid of its natural vegetation.
This loss of habitat poses a significant threat to the survival of Haworthia attenuata var. radula and other species in the area. Conservation efforts are crucial to protect the remaining populations and restore their habitats to prevent further decline. The destruction caused by human activities underscores the importance of preserving and safeguarding the natural environment for future generations.

Description:

Haworthia attenuata var. radula presents several distinct characteristics that set it apart from its close relative, Haworthia attenuata. One notable feature is the presence of smaller and more numerous tubercles across its leaves, in contrast to the larger and fewer tubercles found on Haworthia attenuata. These tubercles, along with the scabrid texture of the leaves rather than tuberculate, contribute to the unique appearance of Haworthia attenuata var. radula. The leaves themselves are longer and more slender, lending the plant an elegant, silvery hue due to the abundance of tubercles.
In terms of growth habit, Haworthia attenuata var. radula is characterized by its acaulescent stem, meaning it lacks a visible above-ground stem. Instead, it forms compact rosettes that hug the soil surface, reaching diameters of up to 15 cm and often forming dense clumps over time. The erect orientation of the leaves, coupled with their attenuate shape, creates a striking architectural effect in the overall appearance of the plant.
The leaves of Haworthia attenuata var. radula are densely covered with minute white tubercles on both sides, adding to its tactile and visual appeal. This dense covering serves not only as a protective adaptation but also contributes to the plant’s ability to reflect light, enhancing its silvery sheen.
During the flowering season, which typically spans from November to December, Haworthia attenuata var. radula produces a sparsely branched and lax inflorescence. Standing at heights of 24-30 cm, the inflorescence bears delicate white flowers adorned with reddish-brown veins, adding a splash of color to the otherwise understated palette of the plant.
Overall, the detailed morphology and growth habits of Haworthia attenuata var. radula make it a captivating addition to succulent collections, offering both visual interest and botanical intrigue throughout the growing season.

Cultivation:

Cultivating and propagating Haworthia attenuata var. radula is generally straightforward, as it’s a resilient plant that doesn’t often encounter significant issues. It thrives in light shade to filtered sunlight, although exposure to more intense light can result in reddening. During the summer, regular watering is necessary, while in the winter, it’s best to allow the soil to dry out more thoroughly. Adequate drainage is crucial for its well-being.
Optimal growth conditions are found outdoors during the spring and summer months, or alternatively, it can flourish on a bright windowsill. Choose a well-draining, moderately fertile soil with a slightly acidic pH level ranging from 5 to 6. Frost should be avoided at all costs to prevent damage.
Maintenance involves the removal of old flower stalks as they wither. Since it’s a species that tends to sucker, a single plant can eventually spread over a large area. To prevent overcrowding, it’s advisable to periodically divide the clumps. Additionally, during the winter months, exposing the plants to cooler temperatures (around 5-10°C) can help stimulate flower development. This detailed care regimen ensures the prolonged health and vibrancy of Haworthia attenuata var. radula.

Propagation:

Propagation of Haworthia attenuata var. radula can be achieved through various methods, including suckers and division of older plants.
Suckers, or offsets, are natural offshoots that emerge from the base of mature plants. These can be carefully removed and replanted in separate containers to establish new individuals. When selecting suckers for propagation, ensure they have developed their own root system for the best chances of success.
Division of older plants is another effective propagation technique. As the plant matures, it tends to form dense clumps or clusters. To propagate through division, carefully separate these clumps into smaller sections, each containing roots and shoots. Be gentle during this process to minimize damage to the root system and ensure the viability of the divisions.
Both methods of propagation should be conducted during the active growing season, typically in spring or early summer, to maximize success rates. Provide appropriate care and conditions, such as well-draining soil and adequate moisture, to encourage the establishment of newly propagated plants. With proper attention to detail, propagation of Haworthia attenuata var. radula can be a rewarding and satisfying endeavor.

Curiosity:

The genus name Haworthia is a tribute to the renowned British botanist and entomologist Adrian Hardy Haworth. Born in 1768, Haworth made significant contributions to the fields of botany and entomology during his lifetime. However, his life was tragically cut short by the London cholera epidemic of 1833.
Haworth’s legacy lives on through his work, and his name is immortalized in the botanical nomenclature, particularly in the genus Haworthia. This genus comprises a diverse group of succulent plants, many of which are prized for their ornamental value and unique characteristics. The commemoration of Haworth in the genus name serves as a lasting tribute to his contributions to the scientific community and the study of natural history.

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