Sweetsop or Sugar Apple is a custard apple relative originating from lowland Central America and the Caribbean. It is now introduced and widely cultivated in other regions of the world, including South America, Southeast Asia, Africa, the Middle East and India.
Sweetsop is typically a shrub or small tree 3 to 5 m (10 to 15 ft) tall, with one or more upright stems, off of which grow long lateral branches forming a wide-spreading, rounded crown. The bark is grey and fairly smooth, though it is sometimes roughened by leaf scars.
Leaves oblong to lance-shaped, 7 to 15 cm (2.5 to 6 in ) long, dull green and in an alternate arrangement along the branches. These fall off the plant in the dry season to conserve water, leaving the branches partly bare until the rainy season, which arrives with spring in its native range. Besides encouraging new leaves to grow, the rains cause the plant to flower.
Flowers oblong, 2 to 4 cm (0.8 to 1.5 in) long and made up of two sets of three petals, the inner set pale-yellow, the outer set yellow-green and leathery and neither set fully opening. They have both female and male parts and hang down on short stalks from the branches, where they attract pollinating insects.
The fruit are heart-shaped and with a lumpy surface of green bumps, less commonly purple, in a scale-like pattern. On young fruit, the bumps appear closely spaced but as the fruit ripens they ease apart and change colour, on green fruited varieties becoming medium green to a pale blue-green and the space between them turns a creamy orange. They are harvested when mature but still firm and range from 6 to 10 cm (2.5 to 4 in) in diameter or 200 to 400 grams (7 to 14 ounces) in weight.
The fruit is fully ripe when soft to the touch and is usually torn apart or sliced open with a knife then eaten fresh out-of-hand. The pulp is in segments that separate easily, each with a large glossy brown seed at the centre, and is sucked away in the mouth leaving the seed behind, which is then spat out and discarded.
The pulp, though scant, is aromatic with a custard-like, slightly granular texture and an agreeable sub-acid, somewhat musky flavour. Care is taken to avoid swallowing the seed which some considered a poison risk if ingested.
The seeds are powdered and used as an insecticide and parasiticide in some countries, especially against lice infestation. The seed oil has also been shown to have an insecticidal effect on some insects.
The fruit pulp contains good amounts of Potassium and Vitamin B1 (Thiamine).
Sweetsop is the most drought tolerant of the cultivated custard apples, growing and fruiting best in sub-humid to humid subtropical and tropical climates, generally frost-free areas with annual lows of 16 to 25 °C, annual highs of 25 to 35 °C, annual rainfall of 700 to 4500 mm and a dry season of 2 to 8 months.
Trees may fail to produce flavoursome fruit in high elevation areas, generally where the average low of the warmest month falls below 18 °C (64 °F).
New plants are usually started from seed, which remain viable for years. However, they are slow to germinate, though this can be sped up by soaking them in water for a few days. It performs best on free-draining loam and sand soils of a slightly acid to alkaline nature, generally with a pH of 6.5 to 8.0 and on sites with full sun exposure.
The root system is shallow but the plant is surprisingly drought tolerant due to its habit of shedding its leaves during dry periods and will do well on thin soils, including gravel and stony soils, providing the roots are well mulched. It has poor tolerance to clayey, slow-draining, waterlogged or saline soils.
Hand pollinating is a recommended to increase fruit-set and yield, which can be low due to the female and male parts of the flower maturing at different times of the day. Yields of 25 to 50 fruit per tree per year have been recorded for trees in southern Florida, which is considered to be low and probably results from poor pollination, due to the absence of the tree's native pollinators.
The fruit contain lots of seed, some of which scatter beneath the tree when the over-ripe fruit fall and splatter on the ground. Seed are also dispersed by animals, including birds that peck out the pulp and carry the seed a fair distance from the parent plant.
It is listed as a weed in at least one reference publication and is recorded as naturalised in more than one country, including Australia, Brazil and the United States (Florida), but there does not appear to be any record of it as a serious weed anywhere in the world. It is assessed as a low weed risk species for Hawaii by the Hawaii Pacific Weed Risk Assessment project (HPWRA).
The leaves and ripe fruit fall to the ground creating litter and the seed have poisonous properties, including being a strong irritant to the eyes if contact is made, such as rubbing the eyes after handling the seed.
Adams, C. D. 1972, Flowering plants of Jamaica, University of the West Indies, Mona, Greater Kingston
Allen, B. M. 1967, Malayan fruits : an introduction to the cultivated species, Donald Moore Press, Singapore
Dastur, J. F. 1964, Useful plants of India and Pakistan : a popular handbook of trees and plants of industrial, economic, and commercial utility, 2nd ed., D. B. Taraporevala Sons, Bombay
George, A. et al. 1998, Custard Apple Information Kit, your growing guide to better farming, Agrilink Series QAL9904. Queensland Department of Primary Industries (QLD DPI), Brisbane
Hocking, D. 1993, Trees for drylands, International Science Publisher, New York
Howes, F. N. 1949, Vegetable gums and resins, Chronica Botanica Company, Waltham, Massachusetts
Jacobson, M. 1958, Insecticides from plants : a review of the literature, United States Department of Agriculture (USDA), Washington D.C.
Jamieson, G. S. 1943, Vegetable fats and oils : their chemistry, production, and utilization for edible, medicinal and technical purposes, 2d ed, Reinhold, New York
Janick, J., & Paull, R. E. 2008, The encyclopedia of fruit & nuts, CABI Publishing, Wallingford, Oxfordshire
Krishen, P. 2006, Trees of Delhi : a field guide, Dorling Kindersley Publishers, Delhi
Lorenzi, H. 2006, Brazilian fruits & cultivated exotics (for consuming in natura), Instituto Plantarum de Estudos da Flora, Nova Odessa, San Paulo
Martin, F. M., et al. 1987, Perennial edible fruits of the tropics : an inventory, U.S. Dept. of Agriculture (USDA), Agricultural Research Service, U.S. Government Printing Office (GPO), Washington, D.C.
Morton, J. F. & Dowling, C. F. 1987, Fruits of warm climates, Creative Resources Systems, Winterville, North Carolina
Page, P. E. 1984, Tropical tree fruits for Australia, Queensland Department of Primary Industries (QLD DPI), Brisbane
Parrotta, J. A. 2001, Healing plants of peninsular India, CABI Publishing, Wallingford, Oxfordshire
Perkins, K. D. & Payne, W. 1981, Guide to the poisonous and irritant plants of Florida, Florida Cooperative Extension Service, Gainesville, Florida
Queensland Department of Primary Industries and Fisheries (QLD DPI) 2008, Queensland tropical fruit : the healthy flavours of North Queensland, Brisbane
Randall, R. P. 2007, The introduced flora of Australia and its weed status, Cooperative Research Centre for Australian Weed Management, Glen Osmond, South Australia
Selvam, V. 2007, Trees and shrubs of the Maldives, Food and Agriculture Organisation (FAO) RAP publication (Maldives), Thammada Press Company Ltd., Bangkok
Shiva, M.P., 1998. Inventory of Forest Resources for Sustainable Management & Biodiversity Conservation with Lists of Multipurpose Tree Species Yielding Both Timber & Non-timber Forest Products (NTFPs), and Shrub & Herb Species of NTFP Importance, Indus Publishing Company, New Delhi
Crane J.H., Balerdi C.F. and Maguire I. 2005, Sugar apple growing in the Florida home landscape. Horticultural Sciences Department Fact Sheet HS38, Institute of Food and Agricultural Sciences, University of Florida
Morton, J. F. 1976, Pestiferous spread of many ornamental and fruit species in south Florida. In Proceedings of the Florida State Horticultural Society (Vol. 89, pp. 348-353).
Watson, B.J., & Moncur, M. 1985, Guideline criteria for determining survival, commercial and best mean minimum July temperature for various tropical fruit in Australia (Southern Hemisphere), Department of Primary Industries Queensland (DPI QLD), Wet Tropics Regional Publication, Queensland
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