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.
Special containers called strawberry jars are a space-efficient way to grow strawberries in a pot. Fruit in strawberry jars is clean and easy to pick. Containers can be moved to a cool, protected place such as an unheated garage during the coldest months.