The main reason for the degenerative growth of garlic is the long-term asexual reproduction, which is caused by the accumulation of virus and poor cultivation conditions. In order to prevent degenerative degradation and improve plant species, the following measures are often adopted: (1) Large-scale seed fields are established, seed fields are to be appropriately planted, early harvesting is adopted, management is strengthened, and fine selection is performed. (2) The use of a wide variety of garlic, not only can save the garlic species, but also increase the yield and achieve the purpose of rejuvenating the species. (3) Change in different places: This must be a rejuvenation effect, but it cannot last long. In other places, attention should be paid to the differences in the regions. The greater the difference, the better the effect.