1. Add splashes of color. With every changing season, a landscape should provide a new display of colors, textures, and fragrances. "It’s best to use one or two and repeat them," Glassman says. Example: white iceberg roses that bloom in spring, summer, and fall as a backdrop; in front, a contrasting punch of purple salvia or lavender that will flower at the same time; and as an accent, a crape myrtle tree that provides changing leaf colors in fall and interesting branches come winter.