zonal geranium

The term "zonal geranium" is a less common name for a type of geranium, specifically referring to Pelargonium × hortorum. These are complex hybrids, widely recognized as the common house or bedding geraniums found in gardens and homes.12

Geraniums, in general, belong to the genus Geranium and are perennial herbs or shrubs, with many species originating from subtropical southern Africa. However, the popular plants commonly called geraniums are actually from the closely related genus Pelargonium. These Pelargonium species are known for their thick, fleshy leaves and flowers that bloom in clusters, ranging in color from white to deep red and violet. They are often propagated by stem cuttings and are valued for their regular symmetry and rapid petal drop. Some geraniums also possess aromatic leaves, releasing scents like mint, fruit, or rose when bruised, and are commercially important for producing geranium oil used in perfumery.2