Leaves dry and brown, flowers small
It sounds as though your black-eyed susans developed a fungal leafspot disease. They are quite drought tolerant, and should not need water more than once per week. Wet foliage and high humidity can promote disease development. Next year, try cutting back on the frequency of watering (but soak the soil thoroughly when you do water). Avoid wetting the foliage as you water; apply the water directly to the soil instead.
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