San Francisco landscape designer Topher Delaney often uses paint to dress up her landscapes and to act as a foil for plants. To ensure that hues are compatible, Delaney chooses her paint first, then selects the plants.
Landscape architect Chad Robert of Phoenix uses strong colors to add accents to a sparse design. "The desert blooms subtly," he says. "Color from paint offers another opportunity to create interest."
So experiment. As Robert says, "If you don't like the color, you can always paint over it."