Petunias are herbaceous perennials, usually grown as annuals, that have become one of our most popular garden plants. The petunias that we grow today comprise a large family of hybrids derived from many species including Petunia axillaris, P. violacea and P. inflata. Petunias are classified into two categories; grandiflora (large-flowered) and mulitflora (many-flowered). The grandiflora petunias have trailing stems and tend to spread. They also have the largest flowers that grow to 5 in (13 cm) in diameter.
