(一)单种同一品种蔬菜,容易发生病虫害。栽培白菜、菠菜等类蔬菜时种几棵薄荷,能减轻虫害;种红萝卜时,再种点茴香,病虫害便不在侵害。司是,茴香开花后会抑帛红萝卜生长,因此,要在开花前拔掉。(二)相克的蔬菜不能靠近或种在一起。例如,土豆和南瓜是死对头,硬让它们作邻居,就会大大减产,甘蓝和芹菜种在一起,都会生长不良,甚至死亡;西红柿和黄瓜种在 (A) a single species of vegetables, prone to pests and diseases. When planting cabbage, spinach and other vegetables planted a few mint, can reduce pests; kinds of carrots, and then planted fennel, pests and diseases would not infringe. Secretary is, fennel flowering will inhibit the growth of silkworm carrot, therefore, unplug it before flowering. (B) grams of vegetables can not be close to or planted together. For example, potatoes and pumpkins are adversaries. If they are neighbors, they will greatly reduce their production. If cabbage and celery are planted together, they will both grow poorly and even die. Tomatoes and cucumbers will be planted in