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Buds and young flowers of a Zinnia elegans variety. Zinnia elegans, called the Common Zinnia, Youth-and-old-age Flower, is an annual flowering plant of the family Asteraceae, is the best known Zinnia. The garden Zinnia is derived from hybridisation from the wild form. Zinnias are popular garden plants with hundreds of cultivars, with many flower colors, sizes and forms, including giant forms in which the flowerhead may be up to 6 in (15 cm) in diameter. Flower colors cover a very wide range range from white and cream, through green and yellow, to apricot, orange, salmon, rose, pink and red, also bronze, crimson, scarlet, maroon, purple, mauve, violet, lavendar and lilac. Some are striped, speckled or bicoloured. The powdery mildew common to Zinnias in humid climates are less an issue among more recent varieties, which are resistant. The flower forms include single, double and semi-double, in addition to single. There are also "pompon" forms that resemble dahlias. Sizes range from dwarf varieties of less than 6 in (15 cm) in height to medium (45–60 cm) up to 3 ft (36 in., 0.75 - 0.9 m) tall.