药用黄茂以独根没权、坚实饱满，色正纹细，绵软味甜，粉性充足并略有豆腥味者为上等品，其品质与采收、加工技术有关。黄茂播种后3～4年即可以采收，但质量不及5～6年生的好．尤以生长7～8年的老黄茂质量最佳。但生长年头过久，内部易成黑心或成为朽根，则不能入药。黄茂在春 Huang Mao medicinal root alone, solid full, color is fine, soft and sweet, adequate powder and slightly beany flavor for the first-class goods, its quality and recovery, processing technology. Huangmao sowing after 3 to 4 years that can be harvested, but the quality of less than 5 to 6 years of good. In particular, the growth of old Huang Mao 7 to 8 years the best quality. However, the growth of a long time, easy to become black heart or become root, you can not medicine. Huang Mao in the spring