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Singularly Beautiful Roses - Newsletter Stephen Hoy is a highly respected rosarian and Civil War author, nationally well known for his love of all roses 'single'. Stephen is the talented creator of "Singularly Beautiful Roses", one of the most beautiful publications dedicated to Single, Nearly Single, and Semi-Double Flowered Roses.. A single-petalled rose is defined as a type of rose having 4 to 8 petals, usually a single row. (A semi-double rose has 9 to 16 petals.) This certainly does not bring to mind one of those long-stemmed beauties seen in the florist shop or at the head of the trophy table. And in the garden the single-petalled rose blooms are only fleeting. So exactly what is the attraction of single-petalled.

The American Rose Society defines the fullness of the bloom based upon the petal count: a rose with four to eight petals is a "single," nine to 16 petals is called a "semi-double," a.. The number of petals, or petal count, is a measure of the fullness of the rose. Single rose are defined by the American Rose Society to have between four and eight petals, while roses categorized as semi-double have nine to sixteen petals, double blooms have 17 - 25 petals, full blossoms are 26 - 40 and very full are 41 or more.