Answer : To become an accredited landscape architect, you need to take a minimum of 4 years of accredited architecture studies and graduate with a Bachelor's degree in Landscape Architecture. Once you have your degree, if not already registered with NAAB (the national organization that registers landscape architects), submit two portfolio entries made up of site plans, sketches or renderings depicting designs for three residential sites. You must also pass a written exam created by NAAB that tests knowledge in the following areas: Site plan construction drawings; taxonomies and principles; planting materials and cultural practices; drainage systems and grading designations used on layout studies linking features on the site to topography, soil types, geology and slope gradients.