Petunia axillaris, the large white petunia, wild white petunia or white moon petunia, is an annual herbaceous plant in the genus Petunia, native to South America. The commonly-grown petunia is a hybrid of Petunia axillaris and Petunia integrifolia.
Petunias are one of the most popular garden flowers for both borders and containers. They are prolific bloomers, although some forms require deadheading to keep them going. However, most petunia varieties will bloom throughout the summer, except in extreme heat. You can find petunias in just about every color but true blue and with growing habits that mound in borders or trail down containers. Petunias have wide trumpet-shaped flowers and branching foliage that is hairy and somewhat sticky. They grow easily when you transplant them to the garden, and this should be done in the spring when the threat of frost has passed.