Once weeds are flowering and firm, it is difficult to effectively control them, so the best time for weeds to be removed is before flowering and firming; once flowering and firming, the seeds will spread very quickly and need to be removed frequently, and prevention should be made in the next year. Seed stage: It can be covered with sawdust, crop straw or black opaque film, which can effectively inhibit seed germination and weed seedling growth. This method is generally used in winter or spring to inhibit weed seeds from germinating in the soil; if weeds are already flowering and firm, this method can be used to isolate the seeds from the soil and reduce the number of seeds that fall into the soil. Grazing: Grazing of goats and sheep can effectively reduce the growth of weeds, and can also help reduce the inventory of soil seed banks. Continuous grazing for 13 years can reduce weed infestation to 5%. Removal: Before weeds are strong, wear gloves or use tools to remove weeds. If the soil is difficult to remove due to drought, it can be used to thoroughly remove the roots of weeds after being irrigated with water. After removal, it can be used in conjunction with deep cultivation to prevent weed roots from remaining. This method is particularly suitable for weeds at the seedling stage or with a relatively low size. Tillage: Weed growth can be completely controlled by performing two tillages in autumn each year for three consecutive years; or tilling every two weeks in the growing season and every three weeks in late summer, weeds can be effectively suppressed for two consecutive years Chemical control: The weeds can be effectively removed by competing herbicides. Note: When removing weeds, you need to wear gloves to avoid direct contact between the body and the weeds, especially for some toxic, thorny, sensitive mucous weeds. When cleaning weeds during flowering, you need to wear a special mask to prevent allergies caused by inhaling pollen.