Countless types of peony cultivars and varieties exist. However, there are currently just 33 officially recognized species of peony (paeony) plants that make up the Paeonia genus, the only genus ...

Semi-double: Flowers have prominent stamens but a large number of outer petals. Semi-double peonies are found across the range of peony colors. Double: Double flowers have dense centers of broad ...

Week five bloomers are perhaps the biggest group of peonies. "White and blush double peonies are typically the last ones to bloom in weeks six and seven; Itoh peonies also tend to be later blooming.