Are there black spots on Jianlan leaves? Find out why and make your leaves green right away!

1. Caused by improper fertilization

When it grows, we always apply some fertilizer to it so that it can grow faster. However, many people do not pay much attention when applying it, and accidentally spill the fertilizer on the leaves, and do not wipe it off in time. This will burn the leaves and cause black spots. This means we need to be more careful when applying fertilizer in the future. We must not let fertilizer spill on the leaves. Even if it is spilled accidentally, we must wash it off with water in time to avoid causing damage to the leaves.

2. Caused by excessive light

Sometimes, when we let it bask in the sun, we don’t notice that the light is too strong, especially in the summer, and we don’t block some of the sunlight in time. Such excessive light will cause its leaves to start to turn yellow and burn, and then it will easily leave black spots. Therefore, we must be careful when giving it light. If the light is too strong, we must not expose it to the sun and must provide appropriate shade.

3. Caused by moisture

If we do not carefully observe the condition of the soil in the pot when watering it, but just water it blindly, it will easily cause excessive water and water accumulation. Once there is water accumulation, it will damage its roots and cause the roots to rot, so there is no way to supply nutrients to the leaves, and the leaves will be more likely to develop black spots. If this happens, you need to reduce the frequency of watering, cut off the damaged roots, and replace the soil in time to eliminate the black spots on the leaves.

4. Caused by pests and diseases

If the temperature is high and the ventilation is poor, some diseases will easily occur. The most common one is anthracnose. Once it occurs, many black spots will appear on the leaves. In fact, when the disease first starts, black spots do not appear directly, but some semicircular or circular brown spots appear on the leaves first, and then continue to expand to form black spots. At this time, we must cut off the diseased leaves in time and spray them with certain pesticides.