Hummingbird Tree is a multiple-purpose tree legume from Southeast Asia, its natural range extending from Malaysia through Indonesia to the Philippines.
Under ideal conditions, it is fast-growing and may reach heights of up to 10 m (32 ft), though is more commonly 3 to 8 m (10 to 26 ft) tall. The trunk is usually straight, with deeply furrowed grey-brown bark and this supports a thin crown of wide-spreading branches. However, it is short-lived, having a useful life of only around five years.
Leaves up to 30 cm (1 ft) long and feathery, being made up of twenty to sixty dull green, oblong leaflets arranged in pairs along the length.
Flowers large, up to 10 cm (4 in) long and with fleshy white petals, though pink and red petalled varieties also occur. Blooms are at their heaviest in the winter months, with lighter blooms occurring on and off throughout the year. The flowers hang in clusters of two to five and possess a somewhat peculiar odour. They are followed by long, thin, stringy seedpods that hang down from the branches. These become brown when mature and then split along their length to release small brown seed.
White flowering varieties are cultivated for their edible, unopened flowers which are steamed, stir-fried, dipped in batter and fried, made into fritters or are added to soups. The flowers of pink or red flowering varieties tend to have a bitter taste and are not often used in cooking.
Hummingbird Tree produces a soft, white, light-weight wood in the 400 to 500 kilogram per cubic meter (25 to 30 pounds per cubic foot) range that is sometimes pulped for use in manufacturing newsprint. Although the wood is light-weight and burns quickly without much heat, it is much favoured as a firewood in its native range due to the tree's fast growth and its ability to coppice or re-grow after harvesting. When grown for pulp or firewood it is planted in dense stands spaced around 90 cm (3 ft) apart.
The bark on wounded yields an edible gum suitable as a substitute for Gum Arabic (from Senegalia senegal). When first exuded the gum is red, or white tinged with red, then on exposure to air hardens to a dark red-violet.
The leaves and young seedpods are valued as livestock feed, with the leaves becoming available less than six months after sowing. They have a combined crude protein content of around 36% of their dry weight.
In traditional medicine, a tea made from the leaves is used as a diuretic and laxative.
Grows naturally in moderately humid to humid tropical lowland climates, generally in areas with annual lows of 18 to 25 °C, annual highs 27 to 35 °C, annual rainfall of 900 to 4000 mm and a dry season of 8 months or less.
New plants are usually grown from seed, which remain viable for up to a year in storage. Performs best on free-draining, moisture-retaining clay and loam soils of a moderately acid to slightly alkaline nature, generally with a pH of 5.5 to 7.5 and on sites with full sun exposure. However, it will grow well in almost any well-drained soil due to its nitrogen-fixing abilities and has good tolerance to seasonal flooding.
It seeds freely, with the seed falling from the seedpods to the ground after they split open. There are reports of open thickets occurring in some areas where it grows, but there does not appear to be any records of it as a serious weed. It is assessed as a low weed risk species for Hawaii by the Hawaii Pacific Weed Risk Assessment project (HPWRA).
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