Petunia, Trailing Seeds
Petunia x hybrida
Trailing petunias usually fall into the spreading and grandiflora categories while compact petunias fall into the multiflora and milliflora categories.
Trailing petunias spread farther than the compact varieties. The cascading grandiflora varieties grow just a few feet, but the spreading petunia varieties can cover a huge area in one growing season. The milliflora and multiflora varieties are more compact, filling in and growing upright rather than horizontally.
The trailing grandiflora petunias work well in window boxes and pots, where they cascade over the containers' edges. Spreading petunias also trail over boxes and pots as well as over walls, where they can grow more than 3 feet in one growing season. The compact petunias work better for splashes of color in the garden, as edging and as accents in large pots.
Care requirements for both trailing and compact petunias are much the same. Both varieties do best in full sun and do not do well in temperatures below 65 degrees Fahrenheit. They thrive in moderately fertile but well-drained soil and with a light application of fertilizer in the middle of the growing season. Both the trailing grandiflora and compact multiflora require pinching of their dead flowers to encourage more blooms. The compact milliflora and the spreading petunias need no pinching of their dead flowers to produce more blooms