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Annona squamosa

life science Maturity 5-7 Next article →

Annona squamosa is a small, well-branched tree or shrub belonging to the Annonaceae family. It is most famous for its edible fruits, which are commonly called sugar apples, sweetsops, or custard apples. This species is highly valued because it tolerates tropical lowland climates better than its relatives, Annona reticulata and Annona cherimola.

Annona squamosa (Custurd Apple) plant in Hyderabad, AP W IMG 9354
Annona squamosa (Custurd Apple) plant in Hyderabad, AP W IMG 9354

Because of this resilience, it has become the most widely cultivated species in its genus. It thrives in hot environments and can grow from sea level up to an altitude of 1,000 meters.

The process of fruit development begins with the emergence of flowers. These greenish-yellow flowers appear in solitary forms or small clusters of two to four during the spring or early summer.

Annona squamosa (Custurd Apple) flower in Hyderabad, AP W IMG 9352
Annona squamosa (Custurd Apple) flower in Hyderabad, AP W IMG 9352

Each flower has three large outer petals and many white stamens. The fruit itself is an aggregate fruit, meaning it forms from many separate pistils that are loosely united. As these pistils mature, they enlarge and fuse into a single, bumpy structure. This ripening process takes approximately three to four months after the flowering stage has passed.

Pollination is a critical step in the reproductive cycle of the sugar apple. The flowers are primarily pollinated by various beetles, including members of the Nitidulidae and Scarabaeidae families.

Young sugar apple seedling
Young sugar apple seedling

In some regions, such as Florida, fruit production can be low because natural pollinators are scarce. Honeybees often struggle to penetrate the tightly closed female flowers. To solve this, farmers can use hand pollination with a natural fiber brush to increase the yield. Once pollinated, the many pistils grow into the distinct segments that define the fruit.

The physical characteristics of the fruit are quite unique among the Annona genus. The fruit is spherical or conical in shape and features a thick, knobby rind. This skin is typically pale green or blue-green, though some varieties show a deep pink blush.

A defining feature is that the segments tend to separate when the fruit is ripe. Inside, the flesh is creamy white or light yellow, offering a sweet, fragrant taste similar to custard. Each segment contains hard, shiny seeds that are dark brown or black. A single fruit may contain anywhere from 20 to 40 seeds, though some varieties are nearly seedless.

Historically, the distribution of Annona squamosa has expanded far beyond its unknown origins in the tropical Americas. Spanish traders transported the plant to Asia aboard Manila galleons, arriving in the Philippines before 1590.

Annona squamosa at Kampung Bukit Jagong 20230629 174058
Annona squamosa at Kampung Bukit Jagong 20230629 174058

Today, the tree is naturalized in many parts of the world, including the United States, Australia, and various islands in the Pacific. It is grown extensively for commercial fruit production in countries like India, Indonesia, Thailand, and China. In Taiwan and Hong Kong, researchers are even working to develop new fruit varieties.

One notable hybrid is the atemoya, also known as the "pineapple sugar-apple." This plant was first developed in the United States in 1908 and is a cross between the sugar apple and the cherimoya. While it shares a similar sweetness to the sugar apple, it possesses a very different flavor profile that tastes like pineapple. This demonstrates how different species within the same family can be combined to create new, popular agricultural products. The sugar apple is also a prolific producer, with a five-year-old tree capable of yielding up to 50 fruits.

Beyond its use as food, the sugar apple plays roles in ecology and traditional medicine. In the Philippines, the Philippine fruit bat eats the fruit and helps spread seeds across different islands. The plant also serves as a host for the larvae of the Tailed Jay butterfly. Humans have used different parts of the tree for centuries. In various traditional medicines, boiled leaves are used to treat infections. In Mexico, the leaves are even used in poultry farming to repel lice. The seeds contain alkaloids like atisine, which can be used as an insecticide, though this is not currently approved by the US EPA or EU authorities.

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🖼️ Images & Media (5)
File:Custard Apple - Flora Sinensis 1656 (2950756).jpg
Custard Apple - Flora Sinensis 1656 (2950756).jpg
File:Annona squamosa (Custurd Apple) flower in Hyderabad, AP W IMG 9352.jpg
Annona squamosa (Custurd Apple) flower in...
File:Young sugar apple seedling.jpg
Young sugar apple seedling.jpg
File:Annona squamosa (Custurd Apple) plant in Hyderabad, AP W IMG 9354.jpg
Annona squamosa (Custurd Apple) plant in...
File:Annona squamosa at Kampung Bukit Jagong 20230629 174058.jpg
Annona squamosa at Kampung Bukit Jagong...
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