Annona Muricata - Soursop / Pawpaw - Rare Tropical Plant Tree Seeds (10) You are purchasing 10 of these rare seeds: Annona Muricata - Soursop, Guanabana, Graviola, Zuurzak Native to Central America and the Caribbean, this tree is part of the custard apple tree family, known for its edible fruits. Also known as the soursop, pawpaw, guayabano, graviola, or prickly custard apple, its fruit has a slightly acidic taste. This flowering tree is tolerant of poor soil and actually prefers lowland areas. It is not frost-tolerant.