Asters are beautiful perennials that are found wild in North America and southern Europe. The genus Aster includes some 600 species of widely distributed flowering plants in the family Asteraceae. Asters are also called as Starworts, Michaelmas Daisies, or Frost Flowers. Asters are found chiefly in North America, with some species extending into South America; others are distributed throughout Europe and Asia. The word Aster is of Greek derivation and refers to the Starlike flowers that can be white, red, pink, purple, lavender and blue, mostly with yellow centers.
The genus Aster is now generally restricted to the old world species, with Aster amellus being the type species of the genus (and of the family Asteraceae). The new world species have now been reclassified in the genera Almutaster, Canadanthus, Doellingeria, Eucephalus, Eurybia, Ionactis, Oligoneuron, Oreostemma, Sericocarpus and Symphyotrichum, but still the new world species are also widely referred to as Asters in the horticultural trade.