Longan, (dimocarpus longan), also spelled lungan, tropical fruit tree of the soapberry family (sapindaceae), native to asia and introduced into other warm regions of the world. The edible white-fleshed fruits are somewhat similar to the related lychee and are commonly sold fresh, dried, or canned in syrup.longan (dimocarpus longan lour.) is a subtropical fruit grown throughout asia, with southern china including taiwan being the main center of commercial production. The longan fruit is a famous summer fruit and is used as a tcm as a stomachic, febrifuge, and vermifuge, and also as an antidote to poison the plant comes in a healthy, well-rooted condition, ready for transplanting into your favorite garden bed, planter, or decorative pot. Its vibrant leaves and sturdy stem ensure long-term growth and easy maintenance, requiring only basic care such as regular watering, occasional pruning, and periodic feeding with organic fertilizer.