Emergency Operations Center. Grounds The White House and grounds cover just over 18 acres (about 7.3 hectares). Before the construction of the North Portico, most public events were entered from the South Lawn, the grading and planting of which was ordered by Thomas Jefferson. Jefferson also drafted a planting plan for the North Lawn that included large trees that would have mostly obscured the house from Pennsylvania Avenue. During the mid-to-late 19th century a series of ever larger greenhouses were built on the west side of the house, where the current West Wing is located. During this period, the North Lawn was planted with ornate carpet-style flowerbeds. The general layout of the White House grounds today is based on the 1935 design by Frederick Law Olmsted Jr. of the Olmsted Brothers firm, commissioned by President Franklin D. Roosevelt. During the Kennedy administration, the White House Rose Garden was redesigned by Rachel Lambert Mellon. The Rose Garden borders the West Colonnade. Bordering the East Colonnade is the Jacqueline Kennedy Garden, which was begun by Jacqueline Kennedy but completed after her husband's assassination. On the weekend of June 23, 2006, a century-old American Elm (Ulmus americana L.) tree on the north side of the building came down during one of the many storms amid intense flooding. Among the oldest trees on the grounds are several magnolias (Magnolia grandiflora) planted by Andrew Jackson, including the Jackson Magnolia, reportedly grown from a sprout taken from the favorite tree of Jackson's recently deceased wife, the sprout planted after Jackson moved into the White House. The tree stood for over 200 years. In 2017, having become too weak to stand on its own, it was decided it should be removed and replaced with one of its offspring. Michelle Obama planted the White House's first organic garden and installed beehives on the South Lawn of the White House, which will supply organic produce and honey to the First Family and for state dinners and other official gatherings. In 2020, First Lady Melania Trump redesigned the Rose Garden. Public access and security Historical accessibility Like the English and Irish country houses it was modeled on, the White House was, from the start, open to the public until the early part of the 20th century. President Thomas Jefferson held an open house for his second inaugural in 1805, and many of the people at his swearing-in ceremony at the