What's wrong with two of the four?
There used to be six of these Palace Purples, all planted in a stand. Two of them did not survive the winter. One of them (#2 from left) ended up being kind of runty this year. Then just this past week #1 from the left, which had been as big and vigorous as #3 and #4, started to wilt. I thought it could possibly be root competition (from a spruce), but I dug them up and the roots look fine. No root competition or critter/pest damage. All in the same bed with about the same light and water. What might be wrong?
Here is the stand:
Here are #1 and #2:
Here are #3 and #4:
Would appreciate any insight and suggestions. Thanks!