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Spotted, dark colors on leaves are an indication of serious problems with your plant. Plant leaves turn black for a number of reasons, including environmental factors and bacterial infections. In some cases the plant is salvageable. However, most of the problems that cause black leaves in plants are irreversible. In every case, prevention is the best way to deal with the disease and dehydration that are common factors in blackened leaves.
Many people mistake black spots on the leaves as a fungal infection when, in reality, itâs due to early frost nipping the leaves. Basil leaves are very fragile, so even a short frost can cause the leaf edges and the more vulnerable top leaves to die. If the spots are from a fungal infection, there are several culprits to choose from, all commonly referred to as blight.