Answer: Zinnia leaves are susceptible to powdery mildew. If you give plants plenty of sunshine, good air circulation between the plants, and avoid excessive moisture on the leaves, they aren't as likely to develop the disease. We can't control the rain, but we can try to keep the leaves dry by not intentionally sprinkling them when applying water. You can try growing zinnias where the sprinkler will get them wet, but you may end up providing the perfect environment for powdery mildew to attack them.
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