The Shrub Border was established in 1982 along the top of the ravine. A woody plant is generally defined as a shrub if it is small or multistemmed. Shrubs often grow surprisingly fast and outgrow spaces where they are planted. Viewing mature specimens such as many in this border can give the homeowner more idea of appropriate spacing. Fine specimens of Korean boxwood (Buxus microphylla var. koreana), the fragrant Korean spice viburnum (Viburnum carlesii), and newer cultivars of ninebark (Physocarpus) and Hydrangea are located in the shrub border.