Can Sophora flowers be dried directly in the sun?

Generally speaking, locust flowers can be directly sun-dried. The detailed explanation is as follows:

Directly sun-drying locust flowers is feasible and commonly practiced. Choose the blooming season, typically April to May, and pick flowers that are plump, bright in color, and free from pests and diseases. After harvesting, gently rinse the flowers with clean water to remove dust, leaves, and other impurities. Handle carefully to avoid damaging the flower structure. Once cleaned, the flowers can proceed to the drying stage.

When directly sun-drying locust flowers, evenly spread the washed flowers on a clean bamboo tray or gauze and place them in a well-ventilated and sunny area. The layer should not be too thick to ensure each flower fully contacts sunlight and air. During the drying process, regularly turn the flowers to prevent some from being compressed and failing to dry thoroughly. Usually after 2–3 days, the locust flowers will become completely dry and brittle, indicating the drying process is complete.

Proper storage of dried locust flowers is also crucial. Prepare a sealed container or bag in a dry, cool, and well-ventilated place, and place the dried flowers inside. For long-term storage, refrigeration in a refrigerator is recommended to prevent moisture absorption, mold growth, or insect infestation, which could affect subsequent usage.

Although locust flowers can be sun-dried directly, if one wishes to improve their taste and reduce bitterness, blanching before drying is also an option. Briefly immerse the cleaned flowers in boiling water, then remove and drain them before drying. Both direct sun-drying and blanching prior to drying have their own advantages and disadvantages. The choice of method can be based on personal needs and preferences.