Field thistle is native to North America. In the states of Arkansas and Iowa, it is considered a noxious weed as it is extremely poisonous. Despite this, the weed is rarely consumed by grazing animals, but care should be taken when handling the plant as contact may result in dermatitis. Another problem with this weed is that it inhibits the growth of neighboring plants, thereby frustrating any efforts to grow or conserve other species. Field thistle can be removed through the application of chemical herbicides.

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. Unplugging: Before weeds are strong, wear gloves or use tools to dig out 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. Pruning: Pruning before weeds can effectively control the spread of weeds, especially for annual weeds. Frequent pruning can suppress the growth and fruiting of weeds, which can effectively remove weeds that year. Tillage: Tillage the soil before cultivation, pick up and discard perennial weed roots, expose to the sun, or bury it deeply. It can also be used to make organic fertilizer and compost with weeds. 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.