Syzygium aqueum , watery rose apple, water apple, Jambu air and bell fruit.

Syzygium aqueum is a tree of family Myrtaceae native to Malaysia, Southern India, New Guinea and Queensland. Its common names include watery rose apple, water apple, Jambu air and bell fruit.

The tree requires heavy rainfalls. In the Philippines, it is locally known as tambis and is often confused with macopa (Syzygium samarangense).

The tree is cultivated for its wood and edible fruit. The fruit is a pear shaped, fleshy yellow or red berry which is bell shaped, has a waxy peel and crisp, juicy pulp.

The fruit has a very mild and slightly sweet taste similar to apples, and a crisp watery texture like the inside of a watermelon. Fruit is generally seedless, but sometimes may have 1-4 small seeds.

It is a staple of Southeast Asian fruit stands, where it is inexpensive while in season. It does not bruise easily and may be preserved for months in a household refrigerator.

The fruit skin is rich in Vitamin A. In the past, Malaysian women who had given birth would eat a ceremonial salad containing the fruit.

The wood is hard and can be used to make tools. The bark of the tree is sometimes used in herbal medicines, an astringent bark decoction is used to treat thrush. It is grown in orchards and gardens and parks as an ornamental plant. The leaves are edible and are sometimes used to wrap food.

It grows best in open, tropical environments. Add well-rotted compost to the soil before planting. During the first 2 years of growth, the trees should be carefully weeded, watered and mulched with regular applications of manure or complete fertilizer. After the trees have become established, they require minimal maintenance. This species grows quickly and will produce fruits within 2- 3 years. For optimal fruit production, apply a compound fertilizer after harvesting the fruits. 

This species is typically propagated by air layering. It can also be propagated by cuttings, budding, marcotting and grafting. Although seeds can be planted, they do not store well and must be planted immediately.

Reference 

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Plants of Singapore

Water Apple

Rose Apple

JambuAir

Syzygium Aqueum

Trees Of Singapore