The first Moss roses appeared as sports or mutations of Centifolia roses during the eighteenth century. Later they were joined by sports of Damask roses, which brought with them repeat blooming characteristics and darker colors. The name of this class comes from the fragrant, piney-scented glands that cover the buds, sepals, and pedicels, giving the plant a fuzzy appearance and a characteristic that is unique among roses. Plant size and garden habit are variable among the Moss roses. Most of them are very hardy, but they do tend to be highly prone to powdery mildew when conditions are favorable for this disease. All of the Moss roses bloom heavily in early summer, with some rebloom occurring late in the season. Flower color ranges from white to very dark crimson.