I believe you have too many planted at once. It's better if you plant them one at a time. Dig out the bushes below the wilted one and replant them one day at a time.
From what I've learned, you may have too many bushes/trees already in the acre. Usually they grow depending on how many is in an acre/area of the town, and if there are too many in that acre/area, they die. That's based off of what happened to me in both of my towns multiple times.