Petunia is a genus of about 20 species. plant produces showy, funnel-shaped, single or double flowers that are sweetly perfumed. The species range in size from 15 cm to 120 cm (6 inches to 4 ft) in height. It blooms in Spring, Autumn, Summer. Its foliage is hairy and branching. Petunia prefers fertile, moist, but well drained soil, with a pH between 6.0 and 7.0.