You can often effectively treat mild to moderate fungal diseases with horticultural or plant-based oils, such as jojoba or neem oil. Start treatment as soon as you spot any fungal disease symptoms and repeat applications every seven to 10 days, or according to label directions. Fungicidal oils work only on contact, so be sure to completely cover the foliage when you spray. Carefully read and follow label instructions and safety precautions.

Fungal pathogens often overwinter in plant debris, so rake up and destroy fallen leaves and decaying plant material when the growing season ends. Plant your zinnias in rich, well-drained soil that receives full sun. Not only do these annuals thrive in fully sunny locations, but fungal diseases also prefer to infect plants growing in shady, moist conditions.

Water your zinnias about once a week. Using a soaker hose, water just around the base of the plant until the top 8 to 12 inches of soil receives moisture. Water early to mid-morning so the foliage has a chance to quickly dry in the sun. Space multiple zinnias so each plant receives plenty of air circulation. Ample airflow helps keep fungal pathogens off of your plants.
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