Melampodium Divaricatum Butter Daisy, Known As Medallion Flower - 20 Seeds Melampodium, also known as medallion flower, is a newly popular garden flower valued for its tolerance of hot, dry conditions and resistance to pests and disease. This annual flower requires only the most basic care to thrive during the summer months and is considered one of the easiest flowers to grow. Melampodium plants reach up to 24 inches in height, depending on the cultivar, and produce yellow, daisy-like flowers in abundance. The plant's attractive green foliage is a wonderful backdrop to the small, dainty blooms that appear in early summer and last until the first frost. Grow melampodium from seed or container-grown plants from your local nursery, if you can find them. Hardiness Zones: Melampodium plants are grown in zones 5 through 10. Considered summer annuals, they are killed by the first frost.