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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.
Lepto leaf spot. Caused by the fungus Leptosphaerulina briosiana, this disease is also called âpepper spotâ and is most common in cool, wet weather on young leaves and petioles of recently cut stands. It produces small, reddish-brown to black spots, enlarging to form oval-round tan spots with a darker border.