Syzygium aqueum
| Water apple (Syzygium aqueum) | |
|---|---|
 | |
| Scientific name | Syzygium aqueum [1][2] |
| Common names | Water apple; watery rose apple; water cherry; Java apple; bell fruit; jambu air |
| Genus | Syzygium |
| Family | Myrtaceae |
| Order | Myrtales |
| Growth form | Evergreen tree; commonly 5–10 m in Singapore, with larger forms recorded elsewhere [3][5] |
| Native range | Nicobar Islands to northern Queensland, including Malesia and nearby tropical regions [2] |
| Climate and site | Wet-tropical lowlands; open sun, reliable water in dry periods, and free-draining fertile soil [3] |
| Pollination | Bisexual flowers; listed as self-pollinated by NParks [3] |
| Propagation | Air-layering, cuttings, budding, marcotting, grafting, and fresh seed [3][4] |
| Fruit | Pear-shaped, thin-skinned, juicy, crisp berry; often seedless, but sometimes with 1–4 small seeds [3] |
| Years to fruit | About 2–3 years in the NParks cultivation account; site and plant material affect bearing [3] |
| Harvest | Singapore production is typically January–March and July–September; other climates can differ [3][4] |
Water apple (Syzygium aqueum) is a small evergreen tropical fruit tree with crisp, juicy fruit and a range of regional names including watery rose apple, water cherry, Java apple, bell fruit, and jambu air. The accepted species belongs to Myrtaceae in the order Myrtales. [1][2][3]
Description[edit | edit source]
NParks describes a dense, spreading tree with a short trunk, elliptic leaves, white flowers with conspicuous stamens, and pear-shaped berries about 5 cm long. The skin is shiny, thin, and waxy; the flesh is white, juicy, and crisp. [3]
Fairchild’s South Florida account also identifies the cultivated tree as Syzygium aqueum and describes bell-shaped fruit ranging from pale green to deep crimson. [4]
Published descriptions show size and fruit form can vary with the source and population: the Singapore account gives a maximum height of 5–10 m, while the Flora of Tropical East Africa material indexed by POWO records trees up to 18–23 m and red, globose fruit about 2 cm across. These descriptions should not be collapsed into one fixed mature size or fruit specification. [5]
Cultivation[edit | edit source]
This is a wet-tropical tree of moist lowlands, and NParks records it from riverine settings up to about 1200 m. It can handle a substantial dry season when its roots have ready access to water. In cultivation, keep young trees watered and mulched while they establish, then continue to prevent prolonged root-zone drying without planting into stagnant water. [3]
Soil and water[edit | edit source]
The native setting and cultivation guidance point to moist, fertile, loamy, well-drained soil, especially near streams or ponds. Add well-rotted compost before planting; drainage remains important even where irrigation is reliable. NParks recommends regular watering, weeding, mulching, and fertilizer during the first two years, followed by compound fertilizer after harvest for fruit production. [3]
Sun and humidity[edit | edit source]
NParks lists full sun and describes the species as best in open tropical environments. Fairchild’s South Florida account likewise emphasizes humidity and fertilization for healthy growth and fruiting. Provide an open, warm site with good air movement and enough moisture to support growth, but do not treat South Florida management as a universal prescription. [3][4]
Seasonal changes[edit | edit source]
The native profile is wet tropical, but a pronounced dry period can be useful when water remains available to the roots. NParks lists flowering during the hot and dry period and reports Singapore fruiting mainly from January to March and July to September. Fairchild reports two fruiting seasons in its South Florida context, May to September and November to March. These calendars are location-specific; in cultivation, increase irrigation through dry weather while retaining drainage, and expect flowering and harvest dates to shift with climate. [3][4]
Propagation[edit | edit source]
Air-layering is the commonly reported Southeast Asian method. Cuttings, budding, marcotting, and grafting are also documented. Seeds should be planted immediately because they do not store well; vegetative propagation is useful when a grower wants to preserve a known fruiting selection. [3][4]
NParks reports fruit production within about 2–3 years, while Fairchild describes healthy trees fruiting twice yearly in South Florida when properly tended. Treat both as location- and plant-material-specific growing reports rather than guarantees. [3][4]
Flowering, fruiting, and harvest[edit | edit source]
The bisexual flowers are white and arranged in small terminal or axillary clusters. NParks lists the flowering period as hot and dry, followed in Singapore by fruit crops commonly produced in January–March and July–September. Fairchild’s South Florida account gives a different two-season schedule, illustrating why harvest records should include the growing location. [3][4]
Harvest fruit according to its intended use and local market practice. The species account describes the fruit as crisp and juicy, usually with no seed or with a few small seeds. [3]
Fruit and uses[edit | edit source]
The fruit is eaten fresh or preserved. NParks records a sweet but slightly astringent taste and use in soups and rojak; Fairchild describes fresh eating, use of unripe fruit in salads with salt or dip, and cooked preparations including chutney, preserves, and sauces. [3][4]
Photos[edit | edit source]
References[edit | edit source]
- ↑ [1] GBIF species match: Syzygium aqueum. Exact accepted species match; Myrtaceae; Myrtales; 99% confidence. Accessed 2026-08-28.
- ↑ [2] Plants of the World Online: Syzygium aqueum. Accepted name, native distribution, and synonymy. Accessed 2026-08-28.
- ↑ [3] Singapore NParks: Syzygium aqueum. Species description, habitat, cultivation, propagation, flowering, fruiting, pollination, and food-use account. Accessed 2026-08-28.
- ↑ [4] Fairchild Tropical Botanic Garden: “Rose Apple: An Arch of Bells”. South Florida growing, propagation, fruiting-season, and food-use context for Syzygium aqueum. Accessed 2026-08-28.
- ↑ [5] Plants of the World Online, general information: Syzygium aqueum. Flora of Tropical East Africa morphology record for larger tree size and alternate fruit description. Accessed 2026-08-28.
Image credits[edit | edit source]
- Summary image: Tatiana Gerus, Syzygium aqueum at Mt. Coot-tha Botanic Garden, Brisbane; CC BY-SA 2.0; changes not made.
- Photos image: Steve Fitzgerald, Syzygium aqueum at Cairns Botanic Gardens; CC BY-SA 4.0; changes not made.
