I really didn’t expect to see zinnias in the Caribbean. Anyone who has tried to grow them in a humid environment knows that zinnias + humidity = powdery mildew festival. And yet there they were, time and time again, completely powdery mildew free.
Maybe it’s the hot sun, the soil, or maybe the plants I saw just happened to have decent air circulation around the leaves. I don’t know. It’s a mystery.