A distinct cultivar of Argyranthemum plant named `Supamarg`, characterized
by its compact, uniform, upright to outwardly spreading, and mounded plant
habit; freely branching habit, dense and bushy plants; glossy dark green
foliage; freely flowering habit with numerous inflorescences per plant;
single inflorescence form; pink and white bi-colored ray florets and disc
florets that are initially dark red at the apex and become bright yellow
with development.