Most bedding petunia varieties can be classified as one of two kinds: Multifloras, which have a large number of smaller flowers that tend to be more weather-resistant, and Grandifloras, which have fewer blooms. However, the latter are enormous and often floppy, making them vulnerable to wind and rain unless they are grown in sheltered containers
Petunia Single Flower
How to Grow?
For best results, grow in full sun in a sheltered spot, and keep plants well watered.