Dahlia, a genus of flowering herbs popular as garden flowers. The dahlia is related to the coreopsis and beggar's tick. It is found in North and Central America and in Europe. The original dahlia was native to Mexico and Guatemala. It grew eight feet (2.4m) tall and its flower had a yellow center surrounded by dull red petals. Now there are more than 2,000 varieties of dahlias in many sizes, shapes, and colors.

DahliasDahlias are garden flowers popular for their brilliant blossoms.

The dahlia is generally raised from large spindle-shaped tubers produced by the plant in late autumn. It can also be grown from seeds or cuttings. The plant requires a full season to mature and flowers appear in late summer or early autumn. Rich loam soil and plenty of sunshine and water are needed for growth. The dahlia is named for Dr. Anders Dahl, a Swedish botanist.

The dahlia belongs to the family Compositae. Popular species include the common dahlia, Dahlia pinnata; the cactus dahlia, D. juarezii; and the tree dahlia and the bell tree (or candelabra) dahlia, varieties of D. imperialis.