Answer: Based on your description it sounds like you have taken great care of your junipers. When the older growth at the base of the plant browns out it can indicate overwatering or a poorly drained planting site. Clay can sometimes cause this. However, since they are growing well I doubt this is the problem. Instead I suspect there may be a disease problem. I would suggest you work with your county extension to determine the specific cause of the browning and then work from there. If it is something that requires treatment they will have the most up to date recommendations on what to use and how/when is best to apply it. I hope it is nothing too serious.
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