Annona Squamosa - Sugar Apple - Rare Tropical Plant Tree Seeds (10) This small, semi-deciduous small tree is very similar to the soursop. Its fruit--known as the sugar apple, sweetsop or custard apple--has a delicious, sweet white pulp and is very popular in its native, tropical markets. Originally from the tropical Americas, this subtropical/tropical specimen is adorned with greenish-yellow flowers in spring and early summer. Its fruit is an excellent source of Vitamin C, manganese, thiamin, iron, magnesium, phosphorus, potassium and various B vitamins.