Mahonia nervosa help
I have been having trouble with some young mahonia nervosa plants that are planted in a challenging location next to a sidewalk. I've been giving them plenty of water but the plants with more sun exposure turn red and then brown. I'm attaching a photo so that you can see—the plant on the right is turning red and brown. It gets more sun. Both of these plants looked great to me just a couple of months ago. Do you have any advice? Thanks in advance for your time!
Multnomah County Oregon trees and shrubs