| I like dwarf lantana in containers, they come in different colors and bloom all summer into fall and requires almost no watering. The other posters have good suggestions too, geraniums seem humdrum, but they bloom like crazy and come in many different varieties (zonal, etc). |
Here is a link that might be useful: lantana
| I'll second verbena. It was suggested to me by a friend as an excellent container plant, and it didn't disappoint, blooming all summer long, very vigorously. The kind I had was the "Superbena" type from Proven Winners. This year I'm trying to grow a delicate orange verbena from seed. |
Here is a link that might be useful: Superbena