Lack of nutrition: not applying nutrition solution for a long time will lead to the appearance of yellow leaves. At this time, the nutrient solution should be properly applied to provide nutrients. Poor water quality: the water used is not clean or has not been changed for a long time, which may cause its leaves to turn yellow. At this time, clean and new water should be replaced for it, and the water should be replaced every 7-10 days. Too much light: too much light in the maintenance environment may cause its leaves to turn yellow. At this time, cut off the yellow leaves, and then put it in a cool place to breed.