Gray and Downing co-edited a book on horticulture. He took Vaux on as an associate, having crossed the Atlantic in search of the right candidate. Olmsted and Vaux, who were to have such an effective partnership following Downing’s premature death, met at his house. Torrey corresponded with him and named a genus of plants after him. His professional relationship with Henry (the latter in his Smithsonian capacity) was connected with plans to landscape significant parts of Washington DC; unfortunately Downing drowned before much could be done.