When I was still landscaping for a living, I would use ornamental grasses to mask them.
Fakahatchee Grass or Dwraf Fakahatchee Grass being my favourite species to use - but there are others like Gulf Muhly Grass that will work well in our area.
Here's one of my projects showing before (4-24-09) and after (9-30-09).
In this case I used 1 gallon grasses so they started out very small but things grow fast - especially in Florida - so they achieved the desired effect soon enough.
If it was a Landscape Architect's plan I was following they would have speced a larger size plant to start with and probably more of them, because they are always after instant gratification. But as a Horticulturist, I understand and respect the actually practicality of plant growth habit.
One thing I learned about Ornamental Grasses from a design POV is you need to space them very far apart to achieve the desired effect. 4' OC minimum and many times i would go 5'-6' OC. It all depends on the property and job how it's done.