Some Facts about Soursop. The tree can grow in well-drained soil. Soursop trees must be irrigated regularly to prevent stress, which will cause leaf drop. Reapply mulch annually to the trees. High temperatures from 80°F to 90°F and low (30%) relative The tree has a shallow root system. The tree is highly susceptible to frost and winds. Supplies list for growing a soursop tree After you remove seeds from the soursop fruit, you can plant them for up to 30 days. The shallow root system benefits greatly from copious mulching. The grounded seed of soursop can be used to kill parasites. Here are a list of soursop tree growing supplies you will need to grow a soursop tree. Actually, it is called a flower but to me looks like a yellow acorn. Widening the mulch application area to 5 feet as the treeâs root system expands. Therefore, mulching would help to keep in moisture. The tree is actually very attractive. Soursop, also known as graviola, is the fruit of Annona muricata, a type of tree native to tropical regions of the Americas ().. Soursop is the most drought-tolerant of the annonas and prefers well-drained soils, although it will tolerate a wide range of Hawaiâiâs volcanic soils. It has lush green leaves that are long and slender and has pretty yellow flowers when blooming. Soursop tree care involves copious mulching, and which benefits the shallow root system. Overly high temperatures from 27-32°C and low relative humidity cause pollination issues while slightly lower temps and 80% relative humidity improve pollination. The root, bark, and leaf of a soursop tree can be used to make tea which has been found to treat diabetes. This fruit belongs to the same family with custard apple Soursop can be used to make ice creams and yogurt.