Pine trees are evergreen tree plants, known as one of the world's five major garden trees.

The vitality of pine trees is very tenacious. It can survive in the hot summer and have strong cold resistance. Pine trees have always been synonymous with a strong ability to be suitable for the environment, and they can grow even in a barren environment.

In literary works, pine trees are often used as the symbol of indomitable heroism.

Pine trees also symbolize longevity, and the life of pine trees is relatively long. It is green all year round.

In order to adapt to changes in the winter environment, pine trees use "sleeping" to deal with winter. The cells that were originally connected in the pine tree will be separated in winter, and the cell wall and native matter will be separated.

At this time, the pine tree will turn the starch stored in autumn into sugar, and some will even become fat, protecting the cells without freezing.

When tissue freezes, they grow slowly and accumulate nutrients, while entering the dormant state to resist cold. The crown of the pine tree is not lush and the branches are very sparse.

Pine tree pollen contains a variety of natural activity ingredients. These substances can directly act on the central nervous of human beings, which can significantly improve the function of the nervous system and relieve stress.

Pine pollen is most suitable for those who are stressed and have tight work. In addition, pine pollen can also remove lactic acid from the body, which can enhance the human body's anti-fatigue ability.

Pine trees can resist cold and high temperatures. Pine trees can endure short-term flooding, so pine trees can be used as a "green barrier" for windproofing and sand.

In garden use, the pine tree grows rapidly and has strong adaptability. It is a common urban green tree species.

There are many types of pine trees, which are more common. Let's take a look at these pine trees together!

1. Shimotoli pine in North America. It is a tree of evergreens. Adult trees are about 25 meters high, and the branches are relatively thick about 70 centimeters.

Their trunks look more curved than ordinary trees, have lush branches and leaves, and brown trunks are straight, and many cracks will appear on the surface of the tree.

2. Huashan pine trees. It is a special variety in China. The bark of Huashan pine trees in the seedling period is relatively smooth, and the color is gray-green.

When it grows to adulthood, its bark will crack. Its fruits have just begun to be green, and when they grow up slowly, they become pale yellow. Its seeds can be eaten directly and can be made into edible oil.

3. Caribbean pine. The Caribbean pine tree first appeared in mainland the United States. The Caribbean pine was about 50 meters high after its adults.

The Caribbean pine in other areas is not so tall, the tree height is about 20 meters, and the thickness of the trunk is only about 30 cm.