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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.
1 Not enough sunlight: Gardenias need at least eight hours of full sunlight each day.  Pests: Check your plants for pests underneath the leaves, in the soil, and on the stems. The type of pest will determine which pesticide you will use. Spider mites commonly cause brown spots, and they can be treated with Neem.