Answer: It sounds like the pachysandra was the perfect choice of groundcover for your yard. It is spreading because it is so well suited to the growing conditions. In my experience, the best way to control its spread is to put in place a physical boundary to contain the roots. This can be an installed edging or a simple dug edging or v shaped trench at the perimeter. Even with the help of the edger, you will also have to do a periodic edge trimming to keep it in check.
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