Hoya callistophylla Sabah - Wax plant

The Hoya callistophylla 'Sabah' is a remarkable tropical houseplant prized for its ornamental foliage and graceful growth. Its broad, ovate, dark green leaves are adorned with prominent dark veins and a silvery-marbled lamina, giving it a unique appeal. This cultivar thrives in bright indoor settings, whether potted or hanging. Its stunning, fragrant flowering has earned it the nickname 'Porcelain Flower'. Exquisitely beautiful, it will reward patient gardeners with creamy-yellow umbels tinged with brown, resembling fine porcelain, which will last for several weeks.

The Hoya callistophylla 'Sabah' is also known as the Wax Flower. It originates from a species native to Southeast Asia, particularly Borneo, in the Malaysian province of Sabah, where it grows in the warm, humid forests of the Nabawan district. In these regions, this epiphytic plant climbs up other vegetation, using it as support to reach several metres in height. The Hoya callistophylla develops semi-succulent, matt leaves typically 8–15 cm long and 3–6 cm wide, with moderate growth on lianas that can stretch 2–3 m long. Its spring or summer flowering (when grown indoors) occurs once the plant has reached maturity, producing star-shaped yellow flowers with reddish-brown tips and a porcelain-like texture. Clustered in groups of 15–20 or more, they are borne on long floral peduncles, forming clusters 5–6 cm in diameter. The 'Sabah' develops a denser, more rounded foliage with a glossy texture and more regular veining. Its waxy, star-shaped flowers emit a sweet, floral fragrance.

The genus Hoya belongs to the Apocynaceae family and comprises around 400 species native to the warm, humid regions of Southeast Asia, Australia, and Polynesia, where they thrive in tropical forests. Primarily epiphytic shrubs or lianas, they often anchor themselves to tree trunks and branches using aerial roots, enabling them to grow towards the light. This distinctive climbing habit has made them popular as ornamental houseplants, ideal for training up supports or cascading from hanging baskets.

The Hoya callistophylla 'Sabah' prefers bright, indirect light—ideally 10 hours daily to encourage flowering—but can tolerate some gentle direct morning or evening sun. Use an epiphytic substrate such as an orchid mix and allow it to dry completely between waterings, except in summer or warm periods when watering several times a week may be needed. This species thrives in temperatures between 18°C and 26°C, with a minimum humidity of 60%. You can train it to climb a support or let its flexible stems trail in a hanging display, making it a striking addition to a Hoya collection.