Yes this is one I get every year, it is also scented too and trails right down and across

http://www.growsonyou.com/photo/slideshow/230927-petunia/member/sixpence

There seems to be a bit of confusion here - surfinia is the name of a variety of Petunia - all surfinias trail. Some are smaller than others though, not getting so big, often sold with the word 'mini' in the name somewhere, so make sure you buy the right size ones for what you want.