The silvery damage I've seen matches the damage on Lorn's leaves. William, I don't remember anything unusual about the conditions when my plants showed damage, because I seem to see a bit of it most years and the conditions you describe sound like our typical spring. Wet soil, rain and cloud for long periods interspersed with sudden bright sun. I've gardened around the 40th parallel south for most of my life... and our spring sunlight isn't tempered with much ozone. It's viciously intense - you can feel the strength of it on your skin!
