I have two Pieris Valley Valentine shrubs. They were planted last year and are only a few feet apart so their growing conditions are identical. One is doing beautifully but there is something odd about the other one. The leaves on one of them began to turn a very pale green last summer. Some leaves even turned yellow and fell off especially near the bottom. Yet the plant did survive the winter and flowered profusely this spring. I have removed the spent flowers from both plants. The "good" plant has plenty of new and colorful leaves. The pale plant (it is still pale despite giving it some rhodo fertilizer) is not getting any new leaves. Does anyone have any ideas about what is going on? I would appreciate any help you can give me.