Washing powder can control the pests of most potted flowers. Spray 1000 times detergent solution on the leaf surface of flowers to keep the flowers from the harm of red spiders for about half a month. For the perennial herbs, woody flowers on the shell Insects spray 1000-fold detergent solution every 3 to 4 days for 2 to 3 consecutive times. There are also obvious control effects. With 1,000 times detergent solution poured around the root of the flower, can prevent flower roots, bulb nematode damage. However, long-term use of washing powder to kill insects will increase the alkalinity of pots and soils and affect the normal growth of flowers. Therefore, it is necessary to apply some acidic fertilizers as appropriate, and often change soil in order to prevent potting alkaline.