Potted flowers often appear yellow in the growing season. The reason is mostly caused by improper cultivation and management. Here are some of the "yellow" phenomenon. 1, water yellow Water in pots and soils for a long time causes the soil to lack oxygen, which causes some roots to rot, and the ability of water absorption and fertilizer absorption is weakened. Performance in the young leaves dull yellow, the new tip of the top of the atrophy, branches of small yellow-green. In this case, loose soil should be used to control watering and stop fertilizing. The heavy ones can be removed from the basin, and the earth ball can be blown out after being placed in the shade. 2. Yellow due to over-fertilization or over-concentration, especially yellow leaves caused by partial application of nitrogenous fertilizer. The result is that the new leaves are hypertrophic and shiny, but the leaf surface is not stretched, and the old leaves gradually turn yellow and fall off. At this point should stop the fertilization and appropriate increase in the amount of water to dilute the nutrients, potted fertilizer and water is not enough or a large basin, pot roots are aging or too dense, will also make the leaves of the flower plants thin, yellow, this time should change the basin Change soil, usually during the rain to the beginning of summer. 3, alkaline yellow potted acidic flowers, such as Camellia, Milan, smiling, rhododendron, jasmine, etc., often due to soil alkaline reaction caused by chlorotic chlorosis. It appears in the veins that start from the shoots of the new leaves, and the veins, especially the main vein, remain green, and the yellow-green phase phenomenon is very obvious. As the degree of yellowing increases, the veins gradually lose their greenness, and then the whole leaf turns white. The margins of the leaves are scorched and the leaves fall. In severe cases, the tip of the branches shoots and the whole plant dies. For this “yellowing†phenomenon, it can be improved by applying acidic fertilizers or acidic substances, or it can be applied regularly. 4, yellow The flowers that like the sunshine often cause the leaves to yellow due to lack of indoor illumination. At this time, the pots should be moved to outdoor ventilation. For semi-negative flowers such as asparagus, the leaves will also be yellow under strong light, so to avoid exposure to high temperature and strong light in summer, you should move into the room or build a shade shed. 5, dry yellow Due to the lack of watering for a long time or less watering, yellow or brown leaves and brown edges appeared on the leaves, and the old leaves fell from the bottom up. However, the new leaves generally grow normally. When this happens, water should be added to make the soil no longer lack moisture. 6, yellow Wet and pungent potted plants, such as spider plants, evergreens, and jade cultivars, are exposed to intense sunlight and the leaves have brown and brown edges. This phenomenon occurs, the pot can be placed in the shade. 7, hot yellow Some potted plants that are not able to withstand high temperatures and high humidity are caused by poor ventilation during the summer and yellow leaves caused by improper shading, such as bells and oysters in the summer. Therefore, high temperature and high humidity also tend to cause yellowing of the leaves. The yellowing of the leaves requires attention only to ventilation and cooling, and the basin soil cannot be too wet to prevent it.