Hoya gracilis - Wax plant

The Hoya gracilis is a well-known species, prized for its rapid growth and abundant flowering. Its leaves are elliptical, medium-sized, quite thin, with a delicate appearance. They are dark green in colour and adorned with silvery spots. When exposed to bright light, they take on a reddish hue. The underside of the leaves is lighter and covered in fine hairs. This tropical houseplant creates an elegant cascade of lush lianas perfect for placing on a shelf or in a hanging basket. The flowers, which appear in clusters, are beautifully fragrant and have a waxy texture, earning it the nickname 'Porcelain Flower'. It rewards patient gardeners with umbels of star-shaped red flowers several times a year.

The Hoya gracilis, also known as Hoya memoria, is commonly called the Wax Flower. This species originates from Southeast Asia, particularly the lush tropical forests of Sulawesi in Indonesia and the Philippines, where it thrives in warm, humid conditions. In these regions, this epiphytic plant climbs onto other vegetation, using it as support to reach several metres in height. The Hoya gracilis exhibits fairly rapid growth, with lianas that can spread up to 60 cm in all directions. Its spring or summer flowering indoors is generous once the plant reaches maturity, producing umbels of red, star-shaped flowers with a striking porcelain-like texture. Grouped in clusters of 15 to 20 or more, they are borne on long floral peduncles, forming clusters around 5-6 cm in diameter. Their fragrance is reminiscent of caramel.

The Hoya genus belongs to the Apocynaceae family and comprises around 400 species native to the warm, humid regions of Southeast Asia, Australia, and Polynesia, where they flourish 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 unique climbing habit has made them popular as ornamental houseplants, ideal for climbing up supports or cascading from hanging baskets.

The Hoya gracilis thrives in bright, indirect light—ideally 10 hours a day to encourage flowering—but can also tolerate some gentle direct morning or late-afternoon sun. Use an epiphytic plant substrate such as an orchid mix and allow it to dry out between waterings, except in summer or warm periods when you may water several times a week. This species is sensitive to overwatering and low humidity. It prefers temperatures between 20°C and 30°C, with an ideal humidity level of 50–70%. You can train it to climb up a support or, alternatively grow it in a hanging basket, allowing its flexible stems to trail freely.