Their blooming season is from late spring to fall. Petunias have a trumpet-shaped bloom. The edge of the flower may be ruffled or fluted. There are also double varieties. They have four different size classifications: Grandiflora is a large plant with three-four inch blooms. Multiflora is more compact with smaller flowers. Mil-flora was also known as “Million Bells.” are considered to be a miniature with an abundance of flowers. Ground Covers only reach six inches tall and spread over the ground with an abundance of flowers.
They prefer at least six hours of the sun per day. Petunias require well-drained, light, sandy soil that is fertile. You may amend the soil by adding compost which well help to break up the clay. Also, add fertilizer, ( 10-10-10). Mulch after the plant is two-three inches tall. Water frequently until well established. Fertilize weekly with 5-19-5 fertilizer.