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Reasons and Solutions for Blackened Leaves on Banana Shrub (Michelia figo)

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Once the leaves turn black, the visual appeal is severely affected. To solve this problem, we should understand its possible causes. The most likely one is an environment that is too humid, and the corresponding measure is to regulate moisture. Another is that the concentration of fertilizer applied is too high, or the amount is too much, and the measure is naturally to adjust the fertilizing method. The next situation is the threat of bacteria and other pathogens, so naturally the way to deal with these harmful bacteria is by spraying chemicals.

1. Humid environment

(1) Specific cause: There are two possible situations here. One is determined by the weather, where the ambient humidity is relatively high and the surroundings are quite damp. The second is caused by artificial watering. Watering too much at one time leads to water accumulating in the container.

(2) Solution: If it is caused by the climate, then there is no way for us to regulate it, and we can only move it to a relatively drier place. If it is the second situation, then it is within the range we can regulate. Although it itself has a fairly large demand for water, excessive water will cause harm. Overall, we should follow the principle of watering when dry and stopping when wet. The most important thing is that the amount of water must never be excessive.

2. Fertilizer problem

(1) Specific cause: We all know that when fertilizing most plants, the concentration must not be too high. Otherwise, it will harm the roots. Among these, a very important external sign is blackened leaves. Then there is the issue of amount; even if the concentration is suitable, applying too much is also not good.

(2) Solution: If this is the cause, then the concentration and amount of fertilizer must be adjusted, and adjusted in a timely manner. Try to keep the concentration lower, and the frequency can be slightly higher. Also, the amount each time must not be too much.

3. Bacterial problem

(1) Specific cause: There are some harmful pathogens that may cause the plant to become diseased, and then the leaves turn black. This is also a very possible cause.

(2) Solution: Cut off the infected leaves that have already turned black. Then, spray the appropriate medicinal solution. Next, adjust the surrounding environment; being too humid is also not acceptable.

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