Yes, they can be saved. Gntly wrap the plants in burlap, leaving only the top uppermost follage without a covering. Keep the plabnts wrapped in burlap for 5 to 7 days, and water normally. Remove the burlap and you will notice new darker color in the follage. Do not remove the burlap earlier than 4 days. Your plants are under stress, and the covering of the plants is intended to relieve that stress.