First of all, when designing courtyard greening, we should also consider the adaptability of green plants to the local climate. Take Beijing as an example: influenced by temperate continental air mass in winter, it is cold and dry, and winter winds prevail, mainly from west to north, with strong winds and scarce rain and snow. The average temperature in Leng Yue varies greatly from north to south, with the temperature below 0℃ in the south and -20℃ in the north. In summer, it is warm, hot and rainy, and the temperature difference between north and south is small due to the influence of temperate marine air mass or denatured tropical marine air mass. It is cold and rainy in winter and warm and rainy in summer. Therefore, when selecting plants in courtyard greening, we should first consider their cold tolerance and drought tolerance, so as to overwinter safely and enjoy the scenery. Here are some winter-bearing plants suitable for planting in the northern region, as well as evergreen plants that can survive the winter and enjoy leafy fruits.

A Small Evergreen Broad-leaved Tree —— Buxus Hokkaido

Euonymus japonicus in Hokkaido is a cultivated variety of Euonymus japonicus, a small evergreen broad-leaved tree species in Euonymaceae. Cold-resistant and drought-resistant, it can keep green at -23.9℃. The leaves of boxwood in Hokkaido are leathery, with dark green front and light green back. In the cold winter, the leaves are green and there are no fallen leaves. Its capsule is nearly spherical, with 4 shallow grooves and a diameter of 1 to 2 cm. When the fruit is tender, it is light green, and the sunny side is brownish red. The seeds are almost spherical. When it matures, the peel automatically cracks, revealing orange-red seeds. The trees are covered with red fruits and green leaves. From a distance, it's quite interesting and comfortable.

Boxwood trees in Hokkaido are tall and straight, evergreen all year round, and resistant to pruning and shaping. They are suitable for planting in winter in cold and arid areas in northern China, and can be planted individually, in rows or in groups in courtyard greening.

Buxus macrophylla in Hokkaido is not strict with soil requirements. Sandy soil, loam and brown soil can all be planted, but loam rich in organic matter is the best. Boxwood in Hokkaido has strong resistance to pests and diseases and is not easy to be harmed by pests and diseases. However, due to intensive cultivation management, high planting density and many species, pests of other species are easy to spread. If aphids are found in the dry season in summer, some conventional pesticides can be used.

2. Evergreen low shrub-Castanopsis fissa

Castanopsis fargesii is an evergreen low shrub of Castanopsis in Rosaceae, also known as centipede and dwarf red seed. Castanopsis fargesii blooms from May to June. The fruit is nearly spherical and bright red, and the fruiting period is from September to 65438+February. The tree has a low posture and branches and leaves spread across. In late autumn, leaves turn red and red fruits are numerous, which is particularly eye-catching after winter.

Suitable for clustered planting on slopes, rock gardens, pools or rocks, or scattered planting on lawns, it is an excellent material for rock bonsai.

Li Guo has strong adaptability and extensive management. The requirements for soil are not strict, and it grows best in fertile and permeable sandy loam, and it is also resistant to mild salinity. Cold-resistant, and will not freeze at the low temperature of -20℃. They prefer fertilizer, and when planting, they can apply a proper amount of Trim foliar fertilizer, which can make the plants grow vigorously and the leaves are green and full. Multi-purpose sowing and cutting propagation.

3. North American Begonia Series (excellent varieties of North American Begonia: Robinson, Indian Magic, Doug, Xifu Begonia, etc. )

North American Begonia series plants are mostly trees, with a plant height of 5-13m and a crown width of 5-10m. The crown is round and open, the trunk is straight, and the ornamental value is high. Flowers, leaves, fruits and branches are rich in colors. They bloom in April, with many colors, long flowering period, deeper colors and gradually falling off. Robinson begonia fruit is big, Indian magic begonia fruit and Xifu begonia fruit are small, and Doug begonia fruit is walnut-like and edible. Begonia series has a long fruiting period, with orange-red fruit in autumn, which lasts until winter, generally lasting from the long fruiting period to 65438+ 10 in the following year. Even the fruits on the same tree have different colors every month from June to the next spring, and the fruit viewing period is mostly over half a year.

Seasonal ornamental varieties with rich colors in autumn. It is more suitable for spacious courtyards, villas, pavilions and green squares as individual appreciation or group planting. It can also be a street tree.

Begonia North America is suitable in both north and south China, regardless of soil, but it grows best in fertile soil. Extensive management, but pay attention to the permeability of soil and keep the soil moist, which is most conducive to its growth. The planting time should be from defoliation in autumn to germination in early spring, and the best conditions are cold and warm climate and deep soil layer. For the next year's fruit yield, strong branches can be pruned in winter.