The spacing and sunlight for your Zinnia elegans seem appropriate. Zinnias prefer full sun, and 6 hours of direct sunlight is sufficient for them to thrive. The recommended spacing for Zinnia elegans is 9 to 12 inches apart, which allows for proper air circulation and helps prevent fungal diseases like rust and mildew. Ensure that your current spacing aligns with this recommendation.

As for the organic protectant fungicides, the application frequency will depend on the specific product you choose. It's essential to follow the manufacturer's instructions for the most effective results. Generally, you can expect to apply fungicides every 7 to 14 days, but this may vary depending on factors like weather conditions and disease pressure. Begin applying the fungicide as soon as you notice any signs of rust or mildew and continue until the problem is under control. In some cases, it might be necessary to continue treatment as a preventive measure, especially during periods of high humidity or when conditions favor disease development.

Remember to alternate between different organic fungicides if possible, to prevent the development of resistance in the fungal pathogens. Some examples of organic fungicides include products containing copper, sulfur, or Bacillus subtilis. Always follow the label instructions for proper application rates and safety precautions.
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