Answer: I wouldn't give up on your sand cherries just yet. Because you bought them on clearance, they had probably spent an entire summer in the nursery pots, which may have restricted the roots too much. Add that to the fact that they may not have been watered regularly and it's only natural to expect them to be a little slow in recouperating from their ordeal. It sounds like you planted them properly and based upon their performance this spring, I'd guess the roots are healthy enough to support the plant. So, what you're seeing now sounds more like a response to heat stress than to disease or decline. I would prune them back a bit to encourage healthy new growth and be sure to water them deeply once each week to encourage new root growth. Don't feed them - they're already stressed. Wait until next spring and lightly feed then. And, after they have finished blooming next year, prune them back again. I think they'll snap out of it. If, by next summer they still are not thriving, you can replace them.
Best wishes with your landscape!
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