Dimocarpus longan, commonly known as the longan and dragon's eye, is a subtropical tree species that produces edible fruit. There are numerous cultivars of longan, but only 30 to 40 are grown commercially. In the United States, longan is grown in Hawaii, Florida, and South California. In Southern California, Kohala and Diamond River are two commonly grown cultivars. Most fruits are grown in small scale operations and sold exclusively to the Asian markets in San Diego, Orange and Los Angles Counites.

Native to Asia, longan trees will grow in U.S. Department of Agriculture plant hardiness zones 9 through 11, where they prefer cool and dry winters. Young tree should be protected from extreme cold and hot weather.Young longan leaves are also sensitive to strong winds during vegetative flushing which may result in leaf dehydration, browning, and deformation. Hardened-off mature trees can acclimate and withstand temperature as low as 22 o F for short periods of time, but branches are likely injured at this temperature.

Longan may be grown from seed, however cultivars do not come true from seed and may take up to 6 years to bear fruits of inferior quality. Air layering is the most common propagation methods as tree may bear fruit 2 to 3 year after plants. Trees should be air layered from April through August, where roots will generally form within 12 weeks. Longan bear erraticallywhere in some years little to no fruit is produced. The recently introduced Diamond River cultivar is reported to fruit every year.

Longan trees should be planted in full sun with 20 feet or more spacing away from other trees. Trees are not tolerant of saline soil or water condition. In addition, longan trees thrive on various soil types (sandy loams, sand, etc) provided they are well drained as they are not tolerant of excessively wet or flooded soil conditions. With the drought in California, longan might be an option for some growers as they are tolerant of dry soil conditions.

Longan trees have few insect pests are diseases in California. Citrus Mealybugs have been observed causing problems in longan. Vertebrates pest such as birds and squirrel are a big problem in production.