The scientific name is Dimocarpus longgana Lour. It is also known as longan, puzzle, and stone. It belongs to the family Sapindaceae and the genus Dimocarpus. Longan is also called longan. It is warm in nature and sweet in taste. It is good for the heart and spleen, and replenishes qi and blood. It has good nourishing and tonic properties.

It can be used for insomnia, forgetfulness, palpitation, dizziness and other symptoms caused by heart and spleen deficiency and insufficient Qi and blood.

Characteristics and Characteristics: Evergreen tree, tall tree.

Most of them have even-numbered pinnate compound leaves, with opposite or alternate leaflets; terminal or axillary panicles; spherical fruit with black and shiny seeds.

The flowering period is from March to April, and the fruiting period is from July to August.

It likes temperature and avoids freezing. The annual average temperature is 20-22℃, which is more suitable. It is sensitive to low temperature; usually the annual average temperature is <17.5-18℃, the coldest monthly average temperature is <10℃, and the absolute low temperature is <-5℃. Longan is difficult to cultivate economically.

.

It is relatively drought-tolerant, with the optimum total annual precipitation being 1000-1600mm; it has strong adaptability to soil.

Wild longan is a common tree species in the semi-evergreen monsoon forest on the low hills and terraces of southwestern Hainan.

The annual average temperature in the distribution area is 24-26℃, and the annual precipitation is 900-1700 mm.

It likes dry and hot habitats. During the growth and development process throughout the year, it requires a temperature of 18-25℃ and appropriate drought in winter and spring (November--April). The growth period in summer and autumn (May--November) requires 26--

A high temperature of 29℃ and abundant rainfall.

It is a light-loving tree species. Seedlings cannot tolerate excessive shade, and mature trees need full sunlight.

It has good natural renewal and is a deep-rooted tree species that can take root and grow in dry and lean soil.

It has strong germination ability and can quickly germinate and regenerate tree stumps in logging or fire-scarred areas.

Natural growth is slow. The height of the tree born in 1983 is only 20.2 meters and the diameter at breast height is 27 centimeters.

It blooms from March to April and matures from July to August.

Distribution: Longan is native to southern and southwestern my country. Nowadays, longan in my country is mainly distributed in Guangxi, Guangdong, Fujian and Taiwan. In addition, it is also cultivated on a small scale in Hainan, Sichuan, Yunnan and Guizhou Province.

Countries and regions that cultivate longan in the world include Thailand, Vietnam, Laos, Myanmar, Sri Lanka, India, Philippines, Malaysia, Indonesia, Madagascar, Queensland in Australia, Hawaii and Florida in the United States, etc.

According to pharmacological research, longan contains glucose, sucrose, vitamins A, B and other nutrients, among which more protein, fat and various minerals are contained.

These nutrients are very necessary for the human body.

Especially for people who are busy with their minds, it is more effective to consume the heart, spleen and blood.

Longan can treat physical weakness or mental decline after illness.

It is also suitable for women to take supplements after childbirth.

Li Shizhen recorded in "Compendium of Materia Medica": "Litchi is the most valuable food, and longan is the most valuable food."

Longan is highly praised.

The varieties Dawuyuan, Shixiao, Fuyan, Chuliang and Guangyan longan are rich in nutrients and are precious nourishing enhancers.

In addition to being eaten fresh, the fruits can also be made into cans, wine, pastes, sauces, etc., and can also be processed into Guiyuan dried meat, etc.

In addition, the leaves, flowers, roots and core of longan can be used as medicine.

The longan tree has a hard texture and fine and beautiful texture. It is a raw material for making high-end furniture and can be carved into various exquisite crafts.

Longan contains a variety of nutrients, which can nourish blood and calm the nerves, strengthen the brain and intelligence, and nourish the heart and spleen. Studies have found that longan has an inhibitory rate of more than 90% on uterine cancer cells. Menopausal women are a stage where gynecological tumors are prone to occur, so they should eat it appropriately.

Longan is good for health; longan has a tonic effect and has an auxiliary effect on people who need to take care of themselves after illness and who are weak.

Propagation: Harvest in July-August when the fruits are mature and turn yellow-brown.

The seeds have a short life span. After peeling off the husk, remove the aril and wash them with clean water before sowing.

When the seedlings are 8-10 centimeters tall, plant them in separate beds or move them into nutrient bags, and use half-year or one-year seedlings to afforestation on spring or autumn rainy days.

The forest land should be selected from low hills and terraces with an altitude of less than 500 meters.

Cultivation of varieties must be propagated by grafting.

Protected in longan breeding, wild longan is a valuable germplasm resource.

The wood has a fine structure, is strong and heavy, extremely resistant to corrosion and insect infestation. It is a strong industrial material and is suitable for use in vehicles, boats, bridges, hydraulic engineering, furniture, etc.

The fruit is edible.

It is recommended that the undamaged and widely distributed semi-evergreen monsoon forest be designated as a wild longan nature reserve, and a seed orchard be established at a nearby state-owned forest farm to provide germplasm resources for cultivation and breeding.

Longan is well-known as a fruit in southern China and is mostly produced in Guangdong and Guangxi.

Together with lychee, banana and pineapple, it is one of the four most precious fruits in South China.

The tree is one or two feet tall, with long but slightly smaller leaves and white flowers that bloom in early autumn.

In fact, they are heavy and falling, with a round shape, like a bullet but slightly smaller than a lychee, and a greenish-brown skin.

When peeled off, the fruit is crystal clear and pulpy white, and the red-black core inside can be faintly seen, which looks very much like an eyeball, hence the name "longan".

Quanzhou is one of the main longan producing areas in the country and has been rich in longan since ancient times.

Quanzhou people commonly call the fresh longan fruit longan, and longan is dried into longan.

Merchants often refer to both as "longan".

History Longan is native to southern my country, and its cultivation history can be traced back to the Han Dynasty more than 2,000 years ago.

The Northern Wei Dynasty (386-534) Jia Sixie's "Qi Min Yao Shu" says: "Longan is one for intelligence and one for eyesight." Because it matures in the season when osmanthus trees are fragrant, it is commonly known as Guiyuan.

It was listed as an important tribute in ancient times.

Emperor Wen of Wei (535-551) once ordered his ministers: "The rare fruits in the south include longan and lychee, and you should pay tribute every year.