Dahlia is a genus of bushy, tuberous, herbaceous perennial plants native mainly in Mexico, but also Central America, and Colombia. There are at least 36 species of dahlia, with hybrids commonly grown as garden plants.
The stems are leafy, ranging in height from as low as 12 in (30 cm) to more than 6–8 ft (2.0 m). The majority of species do not produce scented flowers or cultivars. Like most plants that do not attract pollinating insects through scent, they are brightly colored, displaying most hues, with the exception of blue.
The dahlia was declared the national flower of Mexico in 1963.