2. Sophora japonica: Planting flowers and trees in ancient courtyards, in addition to viewing, also has the main considerations of regulating geomantic omen, shielding geomantic omen and exorcising evil spirits. For example, planting locust trees at the back of the house is to remove debris and ward off evil spirits. Now people in the county mainly consider whether the tree itself is auspicious or not, and plant trees according to their personal preferences.