His official writing career started when he began producing articles for newspapers and horticultural journals in the 1830s. In 1841 his first book,
A Treatise on the Theory and Practice of Landscape Gardening, Adapted to North America, was published to a great success; it was the first book of its kind published in the United States. In the book, Downing talked about landscape architecture - or landscape gardening - in a way to encourage civility through the care for nature in a domestic scale. Showing that nature can be beautiful and also morally beneficial. In 1842 Downing collaborated with
Alexander Jackson Davis on the book
Cottage Residences, a highly influential pattern book of houses that mixed romantic architecture with the English countryside's pastoral picturesque, derived in large part from the writings of
John Claudius Loudon. The book was widely read and consulted, spreading the so-called "
Carpenter Gothic" and
Hudson River Bracketed architectural styles among Victorian builders, both commercial and private. In this early stage of his career, Downing also engineered landscapes and provided horticultural makeovers to patrons throughout the Northeast. With his brother
Charles, he wrote
Fruits and Fruit Trees of America (1845), long a standard work. In the early 1850s, Downing called the "Jonathan's Fine Winter" apple the "Imperial of Keepers", which led to it being renamed the
York Imperial apple. This was followed by
The Architecture of Country Houses (1850), a revolutionary and influential pattern book that marked the end of his collaboration with Davis. Completing extensive drawings for interiors and furniture, Davis's talents as an artist engaged readers and served as early reference guides for homeowners to decorate their own spaces without hiring additional designers. By the mid-1840s Downing's reputation and celebrity were established. This brought a friendship with
Luther Tucker, publisher and printer of Albany, New York, who hired Downing to edit a new journal.
"The Horticulturist and Journal of Rural Art and Rural Taste" was first published under Downing's editorship in the summer of 1846; he remained editor of this journal until his death in 1852. The journal was his principal influence on society through
horticulture,
pomology,
botany,
entomology, rural architecture, landscape gardening, and, unofficially, public welfare in various forms. It was in this journal that Downing first argued for a New York Park, which in time became Central Park. In it, Downing argued for state agricultural schools, which eventually gave rise. Downing worked to educate and influence his readers in his view of refined taste regarding architecture, landscape design, and even moral issues. In 1845, Downing was elected into the
National Academy of Design as an Honorary Academician. In 1850, as Downing traveled to England, an exhibition of continental landscape watercolors by Englishman
Calvert Vaux captured his attention. He encouraged Vaux to emigrate to the United States, and opened what was to be a thriving practice in Newburgh. Downing and Vaux worked together from fall 1850 until Downing's death in the summer of 1852. Together they designed many significant architecture and landscape projects. They designed and remodeled Hudson Valley residences for the historian
Joel T. Headley,
China Trade merchant
Warren Delano, and brewer
Matthew Vassar. As the firm took on more residential projects, Downing hired
Frederick Clarke Withers (1828–1901) from
London, who joined the firm as a
draftsman in early 1852. Their most prestigious landscape commissions were the grounds of the
White House and the
Smithsonian Institution in Washington D.C. Vaux's work on the Smithsonian inspired an article he wrote for
The Horticulturist, in which he stated his view that it was time the government should recognize and support the arts.
Smithsonian Grounds In 1846, the
Smithsonian Institution was established, and soon a building to house the new institution was started on the
National Mall in Washington, D.C.
James Renwick's Norman-style building stimulated a move to landscape the Mall in a manner consistent with the romantic character of the Smithsonian's building. President
Millard Fillmore commissioned Downing to create a plan that would redeem the Mall from its physical neglect. Downing presented his plan for the National Mall to the Regents of the Smithsonian Institution on February 27, 1851. The plan was a radical departure from the geometric, classical design for the Mall that
Pierre (Peter) Charles L'Enfant had placed in his 1791 plan for the future federal capital city (see
L'Enfant Plan). Instead of L'Enfant's "Grand Avenue," Downing envisioned four individual parks, with connecting curvilinear walks and drives defined with trees of various types. Downing's objective was to form a national park that would serve as a model for the nation, as an influential example of the "natural style of landscape gardening" and as a "public museum of living trees and shrubs." President Fillmore endorsed two-thirds of Downing's plan in 1851, but Congress found it to be too expensive and released only enough funds to develop the area around the Smithsonian. In 1853, Congress cut off all funds so that the plan was never entirely completed. However, federal agencies developed several naturalistic parks within the Mall over the next half century in accordance with Downing's plan. • Remodel of
Warren Delano House, "Algonac,"
Newburgh, New York (1851), burned and rebuilt • William L. Findlay House,
Newburgh, New York (1850–1851), demolished • Robert P. Dodge House, Washington, D.C. (c.1851–1853) • Francis Dodge House, Washington, DC (c.1851–1853) • David Moore House, Newburgh, New York (1851–1852) •
Dr. William A. M. Culbert House, Newburgh, New York (1851–1852), burned with only exteriors walls remaining as of 2026 •
Daniel Parish House, Newport, Rhode Island (1852), burned and rebuilt File:Headley House, "Cedar Lawn" in 1904.png|Joel T. Headley House (1850–1851) File:Springside plans.jpg|Springside landscape design (1850) File:Springside gatehouse.jpg|Springside gatehouse (1850) File:WEST FRONT - 55 Broad Street (House), Newburgh, Orange County, NY HABS NY,36-NEWB,5-1.tif|David Moore House (1851) File:Historic American Buildings Survey Exterior photocopy from C.M. Pepper, Everyday Life in Washington (1900, p. 371) - Robert P. Dodge House, 1534 Twenty-eighth Street Northwest, HABS DC,GEO,116-5.tif|Robert P. Dodge House (c. 1851–53) ==Downing's philosophy==