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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.
The fungus causes wilting and black foliage on large-flowered cultivars. Plant clematis 2-3 inches deeper than it was in the pot; cut stems to the base if the disease strikes.