Hoya callistophylla - Wax plant

The Hoya callistophylla is a species of Wax Flower distinguished by its large marbled leaves. This tropical houseplant creates an elegant cascade of lush lianas perfect for placing on a shelf or in a hanging basket. Its pearl-like, stunning, and fragrant flowering is exquisitely beautiful. It rewards patient gardeners with cream-yellow umbels tinged with brown resembling fine porcelain which last for several weeks.

The Hoya callistophylla is also known as the Wax Flower. This species originates from Southeast Asia, particularly Malaysia, Borneo, and Thailand where it thrives in warm and humid conditions. In these regions, this epiphytic plant climbs onto other vegetation, using it as a support to reach several metres in height. With moderate growth, the Hoya callistophylla develops semi-succulent, matt leaves typically measuring between 8 and 15 cm long and 3 to 6 cm wide on lianas that can reach 2 to 3 metres in length. Its spring or summer indoor lowering, once the plant reaches maturity, appears as pale yellow star-shaped flowers with reddish-brown tips, featuring a remarkable texture reminiscent of porcelain. Clustered in groups of 15 to 20 or more, they are borne on long floral peduncles, forming bouquets around 5-6 cm in diameter.

The genus Hoya belongs to the Apocynaceae family and comprises around 400 species, native to the warm and humid regions of Southeast Asia, Australia, and Polynesia, where they flourish in tropical forests. Primarily shrubs or epiphytic lianas, they often anchor themselves to tree trunks and branches using aerial roots, enables them to grow towards the light. This unique climbing habit has made them popular as ornamental houseplants ideal for climbing supports or cascading down from hanging baskets. These plants were popularised in Europe by the Scotsman Robert Brown in the late 19th century.

The Hoya callistophylla thrives in bright indirect light—preferably 10 hours a day to encourage flowering—but can also tolerate some gentle direct sunlight in the morning or late afternoon. Choose an epiphytic substrate such as an orchid mix and allow it to dry out completely between waterings, except in summer or warm periods when you may water your plant several times a week. This species prefers temperatures between 18°C and 26°C with a minimum humidity level of 60%. You can train it to climb up a support or, alternatively, grow it in a hanging basket, letting its flexible stems drape freely.