Sunflower leaves looking really bad!
We're growing sunflowers in with our small vegetable garden. They were doing really well, growing strong, looking healthy. All of a sudden, they lowest leaves are dead/dying and it seems to be spreading. The lower leaves have developed small brown spots all over them.
Any idea of what this is, and how to treat it?
We're trying to go organic, so I'd rather not add chemicals if possible.
Thanks for any insights.