Try not to use plant growth inhibitors to control the length. The weather in the spring is changeable. Once the days have changed, there is a large cooling temperature. Under the dual effects of low temperature and growth inhibitors, it is very easy to cause excessive control of vegetables. Therefore, it is important to avoid applying plant growth inhibitors as far as possible to prevent vegetable growth in spring, so as to avoid adverse effects on vegetable growth. "Three controls" should be days. In addition to spraying plant growth inhibitors, control of vegetable growers can also be achieved through temperature control, water control, fertilizer control and other "three controls" measures. When these measures are taken, they must be targeted according to the weather conditions so as not to have the opposite effect. Root guaranty should be careful. Some growers who grow melon vegetables have adopted the method of controlling the length of leaves. This practice is good, but it needs to remind farmers to pay attention to the fact that the purpose of leaving the root melon is to control the leggy and avoid selling the money after the roots are left.