Hoya tsangii
Hoya tsangii Care Guide
Featured photohoya-tsangii.jpgHoya tsangii is a Philippine species recognised for its attractively elongated, glossy leaves and clusters of small, deep red to burgundy waxy star flowers with a slightly sweet fragrance. It grows as a vining epiphyte in humid Philippine forests and is a moderate grower in cultivation. Its flower colour — an unusual deep red rather than the typical pink or white of many hoyas — and glossy foliage make it a desirable collector plant.
Care facts at a glance
- Light
- Bright indirect
- Water
- Water when the top 3 to 4 cm of substrate has dried; every 10 to 14 days in summer.
- Humidity
- 50–75 %
- Temperature
- 16–30 °C
- Soil
- Well-draining hoya mix with bark, perlite, and minimal compost.
- Origin
- Humid forests of the Philippines.
- Mature size
- Vining to 2 to 4 m; leaves 8 to 15 cm long.
Overview
Hoya tsangii was described by C.M.Burton and named for botanist Tsang Wai-Tak. It belongs to a group of Philippine hoyas with dark, glossy foliage and relatively small, intensely coloured flowers. The deep red flower colour is caused by high anthocyanin concentration in the petals and contrasts with the pale central star corona. It is a reliable bloomer once the plant has reached sufficient maturity, typically producing multiple umbels per season.
Care Priorities
- Bright, indirect light is necessary for consistent flowering — deep shade results in few or no blooms.
- Allow the substrate to dry moderately between waterings.
- High-phosphorus fertilizer during the growing season initiates and sustains bud production.
- Retain old flower peduncles; new umbels are produced from the same spur each season.
Common Problems
Buds browning and falling without opening are caused by dry air, temperature swings, or moving the plant during bud development. Establish a stable location and maintain humidity. Yellowing leaves with root rot are caused by overwatering — improve drainage. Scale insects can colonise the glossy leaf undersides; treat with isopropyl alcohol.
Sources & further reading (2)
- botanical-garden — accessed 2026-05-08
- encyclopedia — accessed 2026-05-08
Frequently asked questions
What makes H. tsangii different from H. pubicalyx?
Both have dark leaf surfaces and can have dark-coloured flowers, but tsangii typically has a deeper, more uniform red flower and narrower leaves than the broader-leaved pubicalyx.
How long before it flowers?
Typically 2 to 4 years from a stem-cutting, depending on growing conditions. Bright light and phosphorus-rich feeding speed up the process.
Is it suitable for a hanging basket?
Yes — the vining stems trail well from hanging baskets, and the weight of the long leaves creates an attractive pendant display.
