The term 'Purple Perennial' refers to two different types of flowering plants. The first is the IRIS, which is a genus of flowering plants with showy flowers that come in a variety of colors, including purple. The second is the ASTER, which is a genus of flowering plants that includes daisies and sunflowers, and also comes in a variety of colors, including purple. Both the IRIS and the ASTER are perennial plants, meaning they live for more than two years and bloom each year.