Decide before planting what the purpose of the planting will be. Then choose appropriate plant material to accomplish your purpose. The right plant for the spot will be one that requires the conditions that exist, such as available sunlight, soil type and drainage.
Survey the area to be landscaped from the window and then again outside. Allow enough room for growth of trees and shrubs. Decide if you want the window to be partially blocked by the plant material. In most cases, you will not want the entire window blocked and will not want a tree or shrub growing against the house or window. Learn the size of mature plant material and allow room for its growth.
Also take care that large, growing roots are not in an area that might overtake a septic or sewer system or invade the foundation or basement. Consider these points when planning and planting for a window view.