1, sun drying is mainly in sunny days, usually two or three days can be dried. However, the finished flowers are yellowish in color, poor in appearance and quality, and if they are dried on a rainy day, the flowers are more prone to blackening and mildewing, and the yield is greatly reduced.

2, and mechanical drying most of the drying process using the drying room structure, drying room volume from a few cubic meters to hundreds of cubic meters ranging from the higher cost, covers a large area. But high yield, not affected by the climate environment, environmental protection and energy saving, it is difficult to build for small households.