Very strange. I have to wonder if the soil in the are of the shrubs that are not growing is for some reason too dry or wet. Perhaps the irrigation system's distribution is not even. Set out some tuna cans or rain gauges all around the area and run it for a while to see what is caught in the cans. Then you can evaluate if this is the problem. The only other thing that comes to mind is that maybe there is a root problem such as nematodes or root rots. Your County Extension Office can be of assistance in directing you how to have a sample diagnosed for root rots at the state pathology lab.
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