Answer: It does sound as though the hostas are suffering from exposure. I wonder how long they've been planted in their present location? I'd move them to a shady location, in soil freshly amended with organic matter to help retain moisture. It's always stressful on plants to be moved during the height of the summer, but in this case you may be actually prolonging the life of the plants. Get the new bed all ready for them, then choose a cool morning or early evening to move them. Water the soil well a few hours prior to the move to make digging easier. Then dig and replant as quickly as you can so as not to expose the roots to dry air. Since they're going into a cooler, shadier area, they should perk right up. If not, the roots are hardy and will send up new foliage next spring.
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