Poplar, an angiosperm, belongs to Populus of Salicaceae, including Populus euphratica, Populus tomentosa, Populus tomentosa and so on. , commonly known as "white poplar". The leaves turn yellow before they fall. Like willows, the roots of Populus euphratica are aggressive, so they cannot be planted near houses and water pipes. Poplar is the general name of deciduous trees of Populus in Salicaceae. There are more than 100 species in the whole genus, mainly distributed in Europe, Asia and North America, among which there are more than 50 species in China. Poplar is the main tree species in timber forest, shelter forest and surrounding greening. Wood is mostly used as civil building materials, furniture making, matchsticks, sawn timber, etc. , also used as wood-based panels and fibers. Leaves are good feed. It usually refers to the family Salicaceae and Populus, and is divided into five groups: Populus euphratica, Populus euphratica, Populus cathayensis, Populus nigra and Populus macrophylla. Trees, the trunk is usually straight; Bark is smooth or longitudinally dehiscent, usually grayish white. About 100 species, widely distributed in Europe, Asia and North America. Poplar is cold-resistant, light-loving and grows fast; Both sides of the river, hillsides and plains can grow. Wood is white, light, soft and fine, with a specific gravity of 0.4-0.5. It is used in construction, board, matchsticks, paper making, etc. Leaves can be used as feed for cattle and sheep; Bud fat, inflorescence and bark can be used as medicine; Mainly to build shelter forests, soil and water conservation forests or green trees.

Magnolia belongs to angiospermaceae, and there are many kinds of magnolia, which are easy to cross. Hybrid has strong growth potential and adaptability, and it is easy to reproduce asexually. You can choose from natural or artificial hybrid populations and obtain excellent clonal varieties through asexual propagation. In addition, a large number of high-quality seedlings can be obtained quickly by plant tissue culture. Breeding based on garden ornamental should focus on improving its branches, leaves and tree shape, and improving its anti-pollution ability and pruning and shaping ability. Mainly used for garden viewing, residential areas, gardens, schools, factories, hillsides, courtyards, roadsides and buildings, with high ornamental value, it is an ideal tree species for beautifying courtyards. Magnolia is also one of the tools for people to enjoy the cool, especially in the summer afternoon, people go to look for a good place to enjoy the cool in twos and threes. At this time, the huge magnolia is people's unique choice.

Cypress, a gymnosperm, includes Platycladus orientalis, Sabina vulgaris, Platycladus orientalis, Platycladus orientalis and other genera. The cypress has dense branches, many twigs and dense branches. The crown of cypress is completely surrounded by branches and leaves, and the other side can't be seen from one side, mostly dark green cones. The bark is reddish brown and longitudinally cracked. Branchlets are flat. The leaves are scaly and small. Monoecious or dioecious, with a single cone crown. Cones are almost ovoid. Seeds ovoid, wingless. Cypress likes cold and drought. The seeds of cypress, a common temperate plant, can be preserved for about 2 years. Generally, they are harvested in June 5438+065438+ 10, and dried and preserved.