Curled parsley has beautiful, dark green leaves well known as the classic garnish for many popular foods. However, it has many more uses. It is a great winter garden plant and looks beautiful in containers with pansies or other winter color. It is also a favorite food of the black swallowtail caterpillar, so you can plant extra to attract these beautiful butterflies to your garden. The nutritious leaves are high in iron and in vitamins A, C, and E.