When the stems of the plants turn yellow, the middle and upper leaves become yellowish, and the back of the flower disk becomes yellowish-brown, and the ray flowers dry up or fall off. The seeds are hard and show inherent color and can be harvested. When harvesting, the varieties shall be harvested, the varieties shall be aired, the varieties shall be threshed, and the varieties shall be stored or sold. Special attention should be paid to the fact that in some areas, sunflowers are harvested during the autumn and rainy seasons. The temperatures are relatively low and the land is relatively humid. They must be air-dried, diverted, and threshed as early as possible to prevent mold deterioration and reduce the value of commodities. The use of oil species dropped to 9% to facilitate safe storage. Concentrated Extract Powder,Proportional Extract,Extractum,Concentrated Powder Shaanxi Zhongyi Kangjian Biotechnology Co.,Ltd , https://www.zhongyiherbs.com