Planting Fields Arboretum State Historic Park is a large and historic garden in Long Island, New York. It is a 409-acre estate that began in 1913, when William Robertson Coe, a businessman from England, and his wife, Mai Rogers Coe, who came from a wealthy family, bought the land. They wanted a peaceful country home. The estate, called Coe Hall, has a large Tudor-style mansion and gardens designed by famous landscape architects. The Olmsted Brothers, who were well-known in America for designing parks, continued the work after the original landscape designer died. Planting Fields is special because it still has the original size and design, unlike other estates that were changed into golf courses or houses. A new book gives more information about the site and includes photos, drawings, and essays from experts.

The park is not only historic but also changing with the times. A revitalization project is in progress to improve biodiversity by planting native species. For example, the famous double row of European beech trees has been replaced with oak trees that are better for the environment. Meadows that were often cut are now only mowed once or twice a year to support local wildlife. A new garden will also be designed by Piet Oudolf, a well-known expert from the Netherlands. The park is the largest living commission by the Olmsted Brothers, which makes it extraordinary in the United States. The stewardship team hopes visitors will understand the importance of keeping the past alive while helping nature grow.