Sophora japonica does not need too much artificial pruning, and gives full play to its natural drooping characteristics. In order to solve some crown problems, branches should be evenly distributed around by pruning and binding.
When the branches are close to the ground or droop to the ground, cut them 20~30 cm away from the ground, and cut off the drooping branches inside. When the crown reaches the ideal state, it is necessary to cut off the branches that extend outward in time and keep them cylindrical. This shape is suitable for narrow spaces. Such as roadside determinant planting and small flower beds and scenic spots planting.
Pruning should also be carried out to expand the crown of the tree, and at the same time, the drooping branches in the inner room and the branches above the "umbrella top" should be cut off in time. After three or four years, it can basically take shape. This kind of tree is suitable for planting in places with large row spacing, which can be planted alone or in rows.
Extended data
Sophora japonica likes light and is slightly resistant to shade. Can adapt to dry and cold climate. Born in sandy loam with deep soil layer, moist and fertile soil and good drainage. Deep roots, developed roots, strong wind resistance, strong germination and long life. It can resist sulfur dioxide, hydrogen fluoride, chlorine and other toxic gases and smog.
Originally from China, it is widely cultivated in northern and southern provinces, especially in North China and Loess Plateau. Fushun, Tieling, Shenyang and their southern areas are introduced and planted, and they are cultivated all over the north of Guangzhou, but more in the south of the Yangtze River. Hebei, Beijing, Shandong and Jiangsu Shuyang can be seen everywhere.
It was introduced to Japan in Song Dynasty, to Europe from Japan in the middle of18th century, and then to America from Europe. Japan and Vietnam are also distributed, and North Korea is also wild. It was introduced from Europe and America.
The pinnate compound leaves are as long as 25 cm; Leaf rachis is puberulent at first, and then becomes clean; The petiole is swollen at the base, wrapping the bud; Stipules vary in shape, sometimes oval, leaflike, sometimes linear or subulate, falling early; 4~7 pairs of leaflets, opposite or nearly alternate, papery, ovate-lanceolate or oval-oblong, 2.5~6 cm long and 1.5~3 cm wide, with a tapering apex and a small tip, a broad wedge-shaped or nearly round base, slightly inclined, grayish white below, initially sparsely pubescent and hairless; Stipules 2, subulate.
Baidu encyclopedia-Sophora japonica