Rhombus, also known as hairy lychee, originating in Malaysia, belongs to the Sapindaceae shaozi genus, there are 36 species, the Department of Tropical perennial evergreen fruit trees, is one of the famous fruits of Southeast Asia. The rambutan is a tropical perennial evergreen tree plant, is also a famous tropical fruit, in China can be suitable for planting not many places, is a rare fruit. Hainan Province, Baoting Tropical Crops Research Institute in the 60's to introduce test planting success, so far there have been decades of cultivation history. The rambutan is a very economic value of tropical fruit trees, enjoys a high reputation in the market, high prices, planted in Hainan has a certain degree of adaptability, and the southern and southeastern regions are suitable for planting rambutan, high yield, excellent quality, is a very promising tropical fruit trees. Characteristics and features perennial evergreen medium tree plants. The trunk is thick and much branched, the crown is open, the leaves are dark green, the fruits are spherical, long ovoid rows or ellipsoid, strung on the fruiting peduncle, the appearance is yellow, and the flesh is white.

Flowering in February to April, June to August for the fruit ripening picking season. Prefer high temperature and humidity, net wind and low altitude environment. The average annual temperature of 24 ℃ or more, the coldest month average temperature higher than 17 ℃, ≥ 10 ℃ effective cumulative temperature of 8600 ℃ or more, suitable for growth and development, lower than 20 ℃ is slow growth, lower than 5 ℃ there will be frost damage. Three consecutive days of low temperature is not normal flowering and fruiting that year. Requirements for annual rainfall of 1800mm or more, seedling period is not drought-resistant, avoid strong light, need appropriate shade. Fruit reproductive period most need water. Soil to deep soil, rich in organic matter, fertile and loose, good drainage and aeration, pH 4.5 ~ 6.5, basalt formation of impact soil or loam is preferred. Distribution status of rambutan native to the Malay Archipelago, now Thailand, Malaysia, the Philippines, Vietnam and other places have large-scale cultivation. In China, rambutan can be planted in large areas in Hainan Province, belonging to the mountainous rainforest climate of Baoting County is most suitable. Other places such as Sanya, Lingshui, Ledong and other cities and counties in some areas only part of the planting. Ripening period in Hainan in late August - the following year in January began to mature role of rambutan fruit nutrient-rich, for fresh and processed canned food, but also can be made preserves, jams, jellies and winemaking. Seeds contain 37% fat, oil can make soap; bark and roots contain tannins and saponins, the new tips can be used as dyes. In addition, the fruit tree can also be used as an ornamental tree in the garden. Nutritional composition of rambutan appearance beautiful, nutritious, rich in carbohydrates, various vitamins and mineral elements, the main varieties of edible part of 41% -47.3%, sweet to sweet and sour taste, with lychee or grape flavor, delicious and pleasant.