Rose blossoms also have several forms, usually defined by the number of petals and whether the blossom appears flat, as found on many species roses; is cup-shaped, typical of David Austin roses; or has long, pointed buds that then open around a high center, as found on hybrid tea roses and grandifloras.

A single rose has fewer than 12 petals. A semidouble rose has between 12 and 16 petals. A double rose has between 17 and 25 petals. A full rose has between 26 and 40 petals. Very full roses have at least 41 petals, and some may have over 150 petals.