Vines are seldom the stars of the garden or landscape, but  they play important supporting roles in many successful landscapes. Vines enhance the focal points and features of the garden, and in the right location at the right time of year can have their chance to shine, too.  You might choose a flowering perennial climber such as clematis or trumpet creeper or climbing roses to bring glorious color to the garden for several weeks in spring or summer, year after year.