Zinnias are popular garden and cut flowers within the daisy family. They are known for their long stems and varieties of petals. There are three main kinds of zinnias: single-flowered, double-flowered, and semidouble-flowered.
Single-flowered ones have a single row of petals and a visible centre. Double-flowered zinnias have numerous petals and the centre is not visible. Semidouble-flowered is somewhere in between with a visible centre.
Zinnias come in every bright and pastel shades except for blue. There are also bi- and tri-coloured zinnias. These colours are thought to represent absent friends. People associated with zinnias feel intense passion in life.