Hello, I'm a newbie to gardening and am already killing one of my plants: a tray of Silver Dust/Dusty Miller has wilted and appears to be turning from silver to green after only 3 days in my charge. I've left the plants in the treys I bought 'em in, watered them and kept them in my backyard, in part shade. Any idea what the problem might be?

many thanks,

carrie