Hoya callistophylla ‘Black Cat’ is a rare and dramatic cultivar of Hoya callistophylla, celebrated for its dark, deeply veined leaves and bold, sculptural appearance. A member of the Apocynaceae family and native to Borneo and surrounding regions, this exceptional tropical vine is part of the Hoya genus known for its waxy foliage and star-shaped, fragrant blooms.

The leaves of Hoya ‘Black Cat’ are thick, leathery, and highly textured — a deep emerald to nearly black-green with prominent dark veins that create a striking contrast. As the plant matures, the leaves become larger and more elongated, displaying an intricate network of raised venation that feels almost carved. In the right conditions, it produces clusters of glossy, star-shaped flowers in shades of pale cream or blush with a pink centre, releasing a sweet fragrance at night.

Sophisticated, rare, and full of character, Hoya callistophylla ‘Black Cat’ is a collector’s dream — a plant that combines moody elegance with the exotic charm of tropical climbing Hoyas.

Hoya callistophylla ‘Black Cat’ – Care Guide

Light

Thrives in bright, indirect light. Provide several hours of filtered sunlight each day to encourage strong leaf colour and potential blooming. Avoid harsh, direct midday sun, which can scorch the dark leaves, but don’t let it languish in deep shade. A bright east- or west-facing window is ideal.

Watering

Allow the top 3–5 cm of soil to dry between waterings. Water thoroughly, then let excess drain away completely. Overwatering is the most common cause of issues — Hoya ‘Black Cat’ prefers to stay on the drier side. During winter, reduce watering further as growth slows.

Temperature and Humidity

Temperature: Prefers warmth between 18–30 °C. Avoid cold drafts or exposure below 15 °C.
Humidity: Moderate to high humidity (60–80%) is ideal. It tolerates average home humidity but will grow more vigorously and produce glossier leaves with added humidity. Mist occasionally or use a humidifier if the air is dry.

Soil and Potting

Use a loose, airy, and well-draining mix — orchid bark, perlite, and coco coir combined with a little compost or pumice is perfect. This mimics its natural epiphytic environment and prevents root rot. Hoyas like to be slightly root-bound, so repot every 2–3 years in spring to refresh the substrate rather than to size up.

Feeding

Feed every 4–6 weeks in spring and summer with a diluted, balanced fertiliser or one formulated for flowering plants. Avoid over-fertilising, as salt build-up can damage roots. Stop feeding in autumn and winter.

Pruning and Maintenance

Prune lightly to shape the plant or control length, and remove any damaged or yellowing leaves. Do not remove the flower spurs (short stalks from which flowers emerge), as new blooms will grow from these same points year after year. Wipe the leaves gently with a soft, damp cloth to highlight their intricate venation.

Growth and Maturity

A slow to moderate grower, Hoya callistophylla ‘Black Cat’ can reach 1–1.5 metres in length indoors, trailing or climbing elegantly when supported. The foliage alone is showstopping, but when mature, the plant will also produce fragrant, waxy flower clusters under ideal light and humidity.

Common Issues

• Yellowing leaves: Overwatering or insufficient drainage.

• Wrinkled leaves: Underwatering or low humidity.

• Lack of blooms: Insufficient light or nutrients.

• Pests: Occasionally affected by mealybugs or spider mites — treat promptly with neem oil or insecticidal soap.

Background and Benefits

Native to the tropical forests of Borneo, Hoya callistophylla grows epiphytically on tree trunks, absorbing moisture and nutrients from rain and air. The ‘Black Cat’ cultivar was selectively bred for its darker, high-contrast venation and dense leaf structure — giving it a more gothic, sculptural aesthetic.

Like all Hoyas, it’s a natural air purifier and a symbol of patience and endurance — thriving slowly but rewarding careful attention with spectacular leaves and sweetly scented blooms.

Quick Care Summary

• Light: Bright, indirect light; tolerate soft sun

• Water: Allow top few cm of soil to dry between waterings

• Temperature: 18–30 °C; avoid below 15 °C

• Humidity: Moderate to high (60–80%)

• Soil: Airy, free-draining mix – orchid bark, perlite, coco coir

• Feed: Every 4–6 weeks in spring/summer

• Growth: 1–1.5 m trailing or climbing vine; thick, dark leaves with raised veins

⚠️ Toxicity note: Mildly toxic to pets and humans if ingested; may cause mild irritation to mouth or skin.

Styling Tip

Display Hoya callistophylla ‘Black Cat’ in a hanging planter, on a high shelf, or trained up a trellis to showcase its dramatic leaves and climbing habit. Its moody tones pair beautifully with lighter, variegated Hoyas such as Hoya ‘Krimson Queen’ or Hoya wayetii ‘Variegata’ for contrast. In minimalist interiors, its dark foliage serves as a living art piece, while in lush tropical collections, it adds depth and texture. Perfect for collectors seeking something truly distinctive, ‘Black Cat’ is the embodiment of mysterious tropical elegance.