A 300-word third grade essay on observing the longan tree is as follows:

There is a longan tree in our school, which is located in the northwest corner of the playground, which is our "botanical garden". This longan tree is very tall. Its trunk is about 1 meter in diameter and about 10 meters high. The branches stretch out in all directions, and the leaves are densely packed like a big umbrella. When we looked up and saw it, it felt like we were seeing a green hill.

The longan tree is an evergreen plant. Its leaves are always green and look very comfortable. The leaves are oval in shape, dark green on the front and light green on the back. The edges of the leaves have wavy serrations, making them more beautiful.

In spring, the longan tree blooms with yellow-green flowers. These flowers are very small, but they gather together to form a large flower cluster, which is very beautiful. After the flowers fade, they will bear many fruits. The fruits of the longan tree are very delicious. They are spherical, brown on the outside and have a large pit inside. Longan pulp is juicy, sweet and delicious, and is one of people's favorite fruits.

This longan tree has brought us many wonderful experiences. In hot summer, we can sit under the shade of trees to enjoy the coolness and enjoy the fresh air and beautiful scenery. In autumn, we can pick fruits and taste them deliciously. All in all, this longan tree is one of the treasures of our school and we all love it.

Longan is native to southern China

It is one of the famous fruit trees in southern and southeastern China. It is widely cultivated from the southwest to the southeast, with Fujian being the most popular, followed by Guangdong; Yunnan It is also found wild or semi-wild in sparse forests in Guangdong and southern Guangxi. It is also often cultivated in southern and southeastern Asia; it likes a warm and humid climate and can tolerate short-term frosts; propagation methods include grafting, high pressure and seed seedlings.

Compendium of Materia Medica records that longan "is the most expensive food, longan is the most valuable, and longan is the most beneficial." It is also believed that longan meat has the effect of "appetizing, strengthening the spleen, tonifying deficiency and improving intelligence", and longan has a warm taste. Sweet, beneficial to the heart and spleen, replenishing qi and blood, and has good nourishing and tonic effects.