The beautiful Potentillas (or "Cinquefoils") are a great group of colormakers for perennial borders. They're small bushy (only about 18" tall) members of the rose family, and if you look closely, you'll see the five-petaled blooms resemble a small wild rose. Even though these are herbaceous perennials, their growth habit is somewhat "shrub-like", with semi-woody stems. This makes them tough plants that are loved by many gardeners. Also, romantics like the fact that the flower petals are perfect hearts.