A new cultivar of Geranium wallichianum, `Sweet Heidy`, characterized by its abundant, tricolor flowers with purple veins; pale violet centers become purple pink in the middle regions and violet-blue near the margin, its long blooming season, its clean foliage with yellow spots, its prostrate spreading growth habit with good performance as a groundcover and its cold hardiness at least to U.S.D.A. Zone 5.