Areca Palm is a tall, elegant palm originating in the region extending from southern coastal India to Southeast Asia, where it is widely cultivated for its fruit, the seed of which are a popular masticatory.
It may reach heights of up to 30 m (100 ft), though is more typically 15 to 20 m (50 to 65 ft) tall with a smooth, grey, distinctively ringed, pencil-shaped trunk supporting a crown of large palm leaves. The leaves are arching, range in length from 1.5 to 2 m (5 to 6.5 ft) and sit atop a smooth green crownshaft.
Flowering is seasonal in areas with a dry season but continuous in constantly humid climates. The flowers are small, pale yellow and either female or male on large, branched flower stalks arising at the base of the crownshaft. Male flowers open before the female and fall before the latter open, ensuring cross-pollination between different plants.
The flowers are followed by egg-shaped fruit about 5 cm (2 in) long. These are green when young, becoming orange, less commonly scarlet, when ripe with a hard fibrous husk surrounding a single seed. It take about eight months from fruit-set to ripe fruit.
The seed of the ripe fruit are used as a masticatory by a tenth or more of the world's population, which represents hundreds of millions of people.
After the seed is extracted from the fruit, it is sliced thinly, boiled to reduce the tannin content, dried in the sun, then is mixed with other ingredients, usually chewing tobacco and spices, before being wrapped in the leaf of the Betel Pepper (Piper betel) and chewed. The mix of spices and flavourings to accompany betel nut vary by region but may include Cardamon (Elettaria cardamomum), Clove (Syzygium aromaticum), Tamarind (Tamarindus indica) and slaked-lime paste, derived from limestone.
Acrea Palm's slim and graceful form makes it ideal for gardens, either singly or in groups of three or more plants. It has some tolerance to soil salt conditions, though less so than Coconut (Cocos nucifera), which makes it suitable for seaside gardens at some distance from the shoreline.
Alkaloids present in betel nut are known to act as a stimulant and appetite suppressant, the former being the main benefit sought by those who consume it. In India, betel leaf parcels known as 'Pan' are chewed as an after-dinner digestive to combat post-meal sluggishness.
Chewing betel nut is strongly associated with a number of major health problems, including heart disease and oral cancer. However, betel nut is often chewed in combination with tobacco, slaked lime and betel leaf, and it is not clearly understood how much each item contributes to the cause of each disease.
One of the alkaloids present in betel nut is 'Arecoline', a potent vermifuge with a history of use in veterinary medicine as a worming agent for dogs and other animals.
In India, the seed are also burnt to charcoal and powdered to make a dentifrice, a substance mixed with water and applied to a toothbrush in order to whiten the teeth, by removing deposits such as stains, plaque and tartar.
Grows naturally in humid tropical climates, generally fin rost-free areas with annual lows of 18 to 25 °C, annual highs of 27 to 35 °C, annual rainfall of 1300 to 6000 mm and a dry season of 5 months or less, extending to 7 months with irrigation.
New plants are usually started from seed, which germinate readily and are best sown in deep containers with a free-draining potting mix. The young seedlings are kept in a nursery and under shade until they have developed at least three to four leaves, after which they are planted out. In seasonally dry areas, it is common practice to plant the seedlings under a fast-growing tree, to provide shade for their first few years.
Performs best on free-draining clay, loam and sand soils of a moderately acid to moderately alkaline nature, generally with a pH of 5.0 to 8.0 and on sites with full to partial sun exposure. It has poor tolerance to drought and slow-draining or waterlogged soils.
Acrea Palms start to flower and fruit when about six to eight years old.
When Betel Nut seed is ingested, it is known to cause vomiting, diarrhoea, irregular heartbeat, respiratory problems, convulsion and coma.
Areca Palm is recorded as a weed in East Africa, though not as a serious weed or invasive species. It is assessed as a low weed risk species for Hawaii, by the Hawaii Pacific Weed Risk Assessment project (HPWRA)
Pollen released by the male flowers is known to cause hay fever in some people.
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