Container gardening is overrated. Perhaps not so much now as it had been while it was more of a fad a decade or so ago, but it is still overrated nonetheless. Most plants are happier in the ground than they are in confinement. They want to disperse their roots freely to where the goodies are, and not contend with the unnatural temperature fluctuations of contained medium.
There are only a few exceptions for which containment of potted plants is an advantage. Houseplants are the most obvious exceptions. Also, plants that are sensitive to frost can be relocated to sheltered situations for winter if contained. Potted orchids and other flashy bloomers can be prominently displayed while blooming, and then returned to utilitarian locations as they finish.
The justification for the hanging potted plants in the picture above escapes me. Does anyone besides me even notice that they are there? They are hung too high for anyone on the sidewalk to appreciate them, or actually see the flowers that are visible from above. Those on the opposite sidewalk can see them, but only at a great distance across all those lanes of El Camino Real.
Those in cars on the road see less of them than pedestrians. Even those who happen to look up while riding past in convertibles with the tops down will see only the undersides, and only at significant speed. These potted plants would be in the way of the sidewalks if they were lowered to be more visible. No matter where they are, they are not proportionate to the broad road.
Maintenance of the flowers in these many hanging pots was quite a bit of work. The annual flowers needed to be replaced a few times a year, or more if ruined by the weather. Without automated irrigation, someone needed to manually water them, which left puddles on the sidewalks that were more noticeable than the highly hung pots above.
As if all these hanging pots were not already tacky enough, the flowers within were eventually replaced with . . . fake flowers, as seen in the picture below.