In 1917, Waugh published "The Natural Style in Landscape Gardening", which was based on the imitation of natural forms and the use of native vegetation in landscaping. His advocacy for this style can be traced back to Andrew Jackson Downing, who had heavily influenced Waugh. Downing held native plants in high regard and spoke of their potential to recreate the scenery of the wilderness, thus contributing to an appreciation of America's native plants. Another influence was Frederick Law Olmsted, a contemporary of Downing whose use of native species in mass plantings at Biltmore, the Vanderbilt estate near Asheville, North Carolina, in 1890 began a trend characterized by the use of native plants in preference to exotics among landscape designers. Downing's designs were also based on the principle of vistas. Waugh's scenic byway designs for Bryce Canyon and Mount Hood represent this principle. These byways feature “paragraphic” vistas which appear sequentially at turns along the road, accompanied by turn-offs for stopping and taking in the view.