Courtesy Library of   Congress 
       history (Botanic Garden “Elm”) continued 
                Congress  selected Frederick Law Olmsted, Jr., a member of the McMillan Commission, to  implement the redesign of the National Mall. Under Olmsted’s direction, the  Union Square of the McMillan Plan had no trees, thus creating a visual break  between the trees of the Capital Grounds and those of the Mall. There was,  however, strong opposition to this clear-cutting. Olmsted remained well-aware  of this sentiment twenty years later, and it likely influenced his decision to  incorporate trees into his design for Union Square. Specifically, he directed  that, “The existing fine large trees in the old Botanic Garden north and south  of the requisite central open space should be preserved, and should be  reinforced [sic], where the mass of  foliage is weak, by additional trees, obtainable in part by moving to those  positions good trees which must be removed from the central open space.”  Olmsted hoped to preserve these specimen trees while at the same time adhering  to the Mall’s overall “Grand Avenue” theme by showcasing the memorials within  the square’s central open space. 
       From an  anecdotal standpoint the plan to preserve the trees within the square was only  marginally successful, as approximately 41 trees were transplanted and 250 were  cut down. Many memorial and exotic trees were among those lost. Moreover, the  installation of the Capitol Reflecting Pool in 1971 by the architectural firm  Skidmore, Owings & Merrill, destroyed the majority of the trees planted  within the square, forced the removal of the Meade Memorial, and irrevocably  altered Olmsted’s design. With Olmsted’s removals, the installation of the  reflecting pool, and natural mortality, it appears that very few exotics remain  and no memorial trees have survived.