Indonesia, Malaysia, Philippines
Alstonia Macrophylla is a tree with a straight trunk and a high, narrow crown. It can become up to 30 meters tall. The trunk and branches contain white latex. The bark is smooth and has a light grey colour. Leaves are in whorls of three to four, simple, penni-veined, membranous, and globous above. Leaf-blades are 10 to 50 centimeters long, 5 to 15 cm wide, widest in or above the middle, and cuneate at the base.
Flowers are about 7 mm in diameter, white, with narrow corolla tube, placed terminal on twigs.
Fruits are about 30 centimeters long, green and filled with many small hairy seeds that are dispersed far and wide by the wind. The heartwood is yellowish, with a straight and shallowly interlocked grain with a moderately fine to rather coarse texture.
Alstonia Macrophylla is quite hardy and grows quite well even in a hot dry region. Water the plant frequently during the dry season. Once a day, should be enough. The plant can grow fairly well in any kind of soil be it chalky, loamy, clayey or sandy. The soil needs to be well-drained however. Blooming months are from August - November. It usually grows on ridges and hillsides with sandy to clayey soils. It also grows in ultrabasic and limestone soils.
It can be planted as an avenue plant
Plants with thin leaves need daily watering and ones with thick leaves need watering 3-4 times a week. This will also depend on the season. Generally during the blooming period, plants love a lot of water. Try keeping the soil moist. During winters it is better to cut back on watering.
Keep the plants in a well drained soil with a drainage hole at the bottom. This will help to avoid over watering. Take care as to not leave stagnant water on top of the soil. Fertilise the plant once in 2-3 weeks during its blooming period. Do not fertilise it in winters.
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