In choosing an herb of the year, the International Herb Society considers "being outstanding in at least two of the three major categories - medicinal, culinary or decorative." The rose, surely, shines in all three.
Roses - their hips, especially - have long been important in herbal medicine. The main ones used for this purpose are the old species roses, including the red rose of Lancaster, and Rosa rugosa, one of my faves, otherwise known as the hedgehog or Japanese rose, according to The Ultimate Herb Book by Antony Atha, which covers more than 200 herbs and is a reference I use frequently.
Rose hips are sold in lots of places today as a source of vitamin C. Essential rose oil is a player in aromatherapy and dried roses are almost always part of potpourri mixes designed to soothe the nerves.
Culinarily speaking, if that's even a word, rose petals make amazing deserts. I'm remembering an Indian restaurant in New York and a dish of pale pink ice cream. Rose water is used in jellies and jams and all sorts of baked goods, too.