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Zinnias are colorful, low-maintenance annuals that prefer warm weather and bright sunlight. Although zinnias are relatively disease-resistant, they are sometimes plagued by diseases that cause brown spots. The brown spots are usually caused by one of three types of leaf spot -- Alternaria leaf spot, bacterial leaf spot and Cercospora leaf spot.
Forgetting to water your geraniums will eventually cause leaves to turn brown and drop. But over-watering can make plants susceptible to Pseudomona, Erwinia and Xanthomona bacteria and lead to leaf spot, tipburn or blight. Symptoms of bacterial leaf disease include brownish-black lesions.