Sugar apples (Annona squamosa) are the fruit of one of the most commonly grown Annona trees. Depending upon where you find them, they go by a plethora of names, amongst them include sweetsop, custard apple and the apropos scaly custard apple. The sugar apple tree varies in height from 10-20 feet (3-6 m.) with an open habit of irregular, zigzagging twigs. Foliage is alternate, dull green on top and pale green on the underside. Crushed leaves have an aromatic scent, as do the fragrant flowers which may be single or in clusters of 2-4. They are yellow-green with a pale yellow interior borne off of long drooping stalks. Fruit of sugar apple trees is as about 2 ½ to 4 inches (6-10 cm.) long. Each fruit segment typically contains a ½-inch (1 cm.) long black to dark brown seed, of which there may be up to 40 per sugar apple. Most sugar apples have green skins, but a dark red variety is attaining some popularity. Fruit ripens 3-4 months after flowering in the spring.
It can be invasive on tropical islands.