An object of the present invention is to develop a novel Lobelia plant and a breeding method thereof, which allow for first-filial-generation (F1) hybrids exhibiting morphological forms (having the advantages of their two parents and far exceeding the traits of the two parents) desired by their breeder. The present invention thus provides a novel Lobelia plant by crossing Lobelia richardsonii (seed parent) and Lobelia valida (pollen parent), which is a hybrid in genetically stable first-filial-generation (F1) population between the wild species, wherein the F1 population exhibits an even distribution over a range from a hybrid close to the seed parent to a hybrid close to the pollen parent.