Plum Royale boasts shiny purple leaves all summer and is silver with a purple hint in winter. It combines well with silver foliage such as artemisia Silver Mound. Hardy to Zones 4 to 9, this variety features a mounding, compact habit and grows to 14 inches wide and 8 inches tall. Plum Royale prefers part shade (full sun in the Pacific Northwest). Finish time in 4-inch containers is six to eight weeks.