Leaves have turned brown on many of my garden plants, especially my clematis and lilac trees. Do I treat the soil or the plants themselves?
A Form of Garden Blight Due to Wet, Cool Winter Has Invaded My Garden. What Can I Do About It?
Certified GKH Gardening Expert
These links may help you identify the issues.
I would also suggest talking with your County Extension Office. They can help you with a soil test and can look at leaf samples for you.