Second, look at the leaf color: if there are the same plants, put them together. If it is found that the leaves of a certain plant are not green and dull, or wilted, and the lower leaves do not fall off in the season of changing leaves, it means that the vegetative fibrous roots rot due to water accumulation, excessive fertilization, or heavy watering after drought!
Third, look at the leaf shape: the leaves have longitudinal wrinkles and deformities, which also shows that the root system is rotten, mainly on plants with fleshy roots! Because of root rot, leaves can't get water and nutrition locally, which makes these parts stop growing or even shrink!