I installed these crimson barberry's this past march. They were doing good but now have started dieing. I pulled back the mulch and stuck my finger in the dirt and everything is moist. Are they getting too much water? The other shrubs I installed are doing ok. There are 3 different groups across the front of my house and all three groups are doing the same. The get very good sun. I'm attaching 3 pics, starting at the one last healthy shurb and getting worse. the 4th pic would be no leaves.