Huai has one pronunciation, which is pronounced huái.

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Sophora japonica (Styphnolobium japonicum (L.) Schott) is a deciduous tree of the Sophora genus in the Fabaceae family. The bark is dark gray, and the crown is spherical. When old, it becomes oblate spherical or obovate.

The branches and leaves are densely grown, and the leaves are pinnately compound. The inflorescences are terminal and butterfly-shaped, with yellow-white flowers blooming in summer, which are slightly fragrant. The pods are fleshy, rosary-shaped and undehiscent, yellow-green, often hanging from the treetops, and do not fall through the winter. They contain seeds. Seeds are kidney-shaped, brown-black.

Sophora japonica is native to northern China. It grows in South China and Southwest China where there is high temperature and humidity. It is most common in the North China Plain and the Yangtze-Huaihe River Basin in the Yellow River Basin. It is also cultivated in Vietnam, Japan, North Korea, and European and American countries. It likes light but tolerates a little shade, can adapt to colder climates, and has deep and well-developed roots.

It has no strict soil requirements and can grow normally in acidic to calcareous and slightly saline-alkali soil conditions; it is wind-resistant, drought-resistant, and barren, and can adapt to adverse environmental conditions such as urban soil compaction. Propagation is often done by seeding.

As far back as the Qin and Han Dynasties, there are records of planting Sophora japonica along the passage from Chang'an to Zhuzhou, which is one of China's specialty tree species. Sophora japonica has a beautiful crown and fragrant flowers. It is a street tree and an excellent nectar plant. Because of its strong resistance to smoke poison, it is also a good greening tree species in factories and mining areas.

The flowers and pods are used as medicine and have cooling, astringent, hemostatic and antihypertensive effects. The leaves and root bark have heat-clearing and detoxifying properties and can treat sores. The wood is tough, water-resistant, and elastic, and can be used in construction, furniture, and agricultural tools.

Sophora japonica is native to northern China and grows in South China and Southwest China where there is high temperature and humidity. It is most common in the North China Plain and the Yangtze-Huaihe River Basin in the Yellow River Basin. It is also cultivated in Vietnam, Japan, North Korea, and European and American countries.

It likes light but tolerates a little shade, can adapt to colder climates, and has deep and well-developed roots; it has no strict soil requirements and can grow normally in acidic to calcareous and slightly saline-alkali soil conditions; it is wind-resistant and also It is resistant to drought and barrenness, and can adapt to adverse environmental conditions such as urban soil compaction.

The soil for Sophora japonica seedlings should be flat, with good drainage and irrigation conditions, fertile soil, and deep loam or sandy loam. It can adapt to neutral, calcareous and slightly acidic soils, and can grow normally on lightly saline-alkali soil (salt content of about 0.15%), but it will not grow well in drought, barren and low-lying water-filled nurseries.