It is not clear to me what it is you want to accomplish....
Do you want to keep the lawn that is in front of the wall? ( I am thinking about mowing access, here)
Do you want to block the 1/3rd view of the neighboring rooftops?
Do you want the eye to be drawn to NOTICE the wall? Or do you want to camouflage it?
The wall is on your property line, yes?
There is an exciting new cultivar of slow growing Italian cypress called "Tiny Tower" by Monrovia. Remains at about 10 feet tall and 2 ft. around for years.
I have not yet seen them sold here, but Lowe's is supposed to carry them soon. They are cultivated in Monrovia's Georgia nursery so they should do well here. They run about $50 each online.
They require almost no maintenance.
If you want color, there are a number of perennial flowering vines that are not expensive and are Florida friendly. I would do some online research before choosing- some vines are heavenly, some become gigantic garden thugs- some are deciduous, some have thorns, some are quite messy.
If you want a flowering shrub that is not overly dense, Oleander is one of the taller flowering shrubs and is relatively affordable. Oleander would grow tall enough to block the view of the roofs.
Camellias are lovely shrubs as well, but denser and slower growing. More expensive, too.
Of course, any planting would have to have it's need met- sun, shade, wet, dry, etc. You know, plant the right plant in the right place.
Should you want to get fancier ($$$) a fountain or waterfall is always a beautiful focal point.
We contracted for a waterfall, pond and brook designed and built by Village Palms. Quite wonderful.
Let us know what you eventually decide to do- maybe share a few pictures- we love this kind of stuff.
