When you consider plants in the rose family, many would immediately think: “Thorns!” But amazingly, many members in this family are thornless. Ninebark shares this non-prickly feature with such diverse shrubs and trees as chokeberries (Aronia), cotoneasters, kerrias, potentillas, quinces, spireas, crabapples, pears, peaches, mountain ashes, and cherries, just to name a few.