Spectacular Container Gardens: Trailing Petunias - Southern Living - Add color to your outdoor party with potted plants. There’s no need for a patterned tablecloth here. Potted petunias add all the color you need under the glass-top dining table.
Herbs in coffee cans, hung with zip ties. Drill a hole in coffee cans & zip tie to railings! You could pretty much mount any container, like a box in this same way. bigger containers may require more zip ties.