Another large garden area, located above the brick walkway, was created by plantsman Paul Harner (Harner Farms). It was an act of friendship to Centre Furnace and especially recognized his friendship with the McLaughlin family, longtime Board members and supporters of the Historical Society and its efforts. Paul carefully designed and chose plants that were appropriate to the Mansion's setting. This garden has become particularly popular over the years because of its easy accessibility and visibility, and has been expanded into a front and back Harner Border. Because of its distance from those threatening black walnuts, roses have been added, including some from locally grown gardens.

The Paul Harner Borders were originally two beds with a grass path between them when they were installed several years ago. Plans are underway to restore them back to their original design.