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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.
The most frequent cause of brown edges on hosta leaves is drought stress. Hostas grow best in soil that remains evenly moist. The leaves usually begin to droop or wilt before the problem becomes severe enough to cause browning.