Huh?

One of the treasures of the Boston area park system is the Blue Hills Reservation. It is managed by the state's Department of Conservation and Recreation, and the agency does a marvelous job with its upkeep and maintenance.

But what is this sign about? The context is seen in the photo to the right: A tree next to the path. Maybe someone from the agency can reply with a comment.

In the meantime, for fun, you can offer your own thoughts.