How do pines and cypresses survive the winter

Pine and cypress, bamboo and plum are known as "old cold three friends", which are widely distributed in the south and east of North China and are often used as ornamental tree species in gardens. So, how do pines and cypresses survive the winter?

First, how do pines and cypresses spend the winter?

Pines and cypresses spend the winter by adjusting the color of their leaves. Although their leaves are still green in winter, they are much worse than those in spring, summer and autumn. This is due to the low temperature in winter, the production of chlorophyll in the leaves is limited, and anthocyanins are relatively increased, so the leaves are somewhat red. The change of color can weaken the photosynthesis in the leaves and slow down the physiological activity of the trees, thus ensuring the safety of the pine and cypress trees through the winter.

Second, what is the breeding method of pine and cypress?

Sowing: the seeds treated by accelerating germination generally begin to germinate and unearth about 10 days after sowing, and about 20 days are the peak period of seedling emergence, and the germination rate of the nursery can reach 70% and 80%. In order to facilitate the germination and emergence of seeds, the soil in the seed layer is often kept moist, and the bottom water must be permeated before sowing. If the soil is not too dry before the seedlings are unearthed, it is best not to irrigate the head water so as not to reduce the soil temperature and cause surface soil consolidation, which is not conducive to seedling emergence.

Third, the symbolic significance of pine and cypress

People personify the pine tree, to pine than de, practice, to improve their own moral cultivation is also a symbol of indomitable, perseverance, very strong people; pine is widely regarded as an auspicious tree species.

Through the ages, I do not know how many scholars and scholars, song to praise song, poem to sing song. Praise Song's solemn and solemn, proud and towering; Yong Song's experience is cold and evergreen. Pine is the oldest tree species in the world, with a life span of ten thousand years. As the saying goes: a thousand-year tortoise, ten thousand years of pine. It is often said that "happiness is like the long running water in the East China Sea, and the life span is longer than that of Nanshan immature pine".

Su Dongpo, a great writer in the Song Dynasty, loved pine trees all his life. When he was a teenager, he planted pine trees every year. For more than ten years, he personally planted tens of thousands of pine trees. In Dongji, there is a record of "giving teenagers a good understanding of the species of pine, planting tens of thousands of trees by hand, all of which are in the middle beam and pillar". When he was demoted to Huangzhou, he thought of himself as an old farmer, planted pines around his residence, and enjoyed himself with "pine trees everywhere."