Answer: Unfortunately, based on your description I am unable to determine exactly what is happeneing to your shrubs. This type of defoliation can be due to a rooting problem such as encircling roots that were left intact at planting time and are now strangling the plant to a disease problem such as verticillium wilt to something unusual happening such as accidental herbicide exposure. I would suggest you work with your county extension and/or professionally certified nurseryman to try to determine what is happening and then based on knowing that, decide how to proceed. I'm sorry your shrubs are not doing well.
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