How do I prevent zinnias from getting powdery mildew?

Powdery mildew is a common fungal disease that can affect zinnias, causing a white or grey powdery coating on the leaves and stems. To prevent powdery mildew in zinnias, it's important to provide good air circulation and avoid overhead watering. Plant zinnias in a sunny location with plenty of space between the plants to allow for good air flow. Water the plants at the base, rather than from above, to keep the leaves as dry as possible. If powdery mildew does occur, it can be treated with a fungicide. Be sure to follow the instructions on the fungicide carefully and apply it as directed. In severe cases, it may be necessary to remove and destroy infected plants to prevent the disease from spreading to healthy plants. Regular monitoring and prompt action can help keep zinnias healthy and free from powdery mildew.