I have a cherished coreopsis that did spectacularly this summer, but
then started looking sickly. The leaves are silvery gray and the
flowers have stopped coming. I'd hate to lose this plant. Here's a
photo: http://www.inhouzemusic.com/z/coreopsis.html

Any clue as to what is ailing this plant and whether it can be saved?
Come to think of it, I believe this same malady occured to a nearby
scabiosa.

Thanks.

-F