Sophora japonica and Sophora japonica are two different plants. Sophora japonica is more fragrant, but Sophora japonica is not. The pod of Sophora japonica is flat, while the pod of Sophora japonica is nearly round with slightly protruding seeds. The flowering period in Yang Huai is from April to May, and the flowering period of Sophora japonica is late, and some flowers are still blooming until autumn.

As for the old Sophora japonica, it can be Sophora japonica or Sophora japonica, generally at least 100 years old, among which Sophora japonica is more.