Welkinweir is a nonprofit arboretum, garden, mansion, and conservation area located at 1368 Prizer Road, East Nantmeal Township, Pennsylvania, United States, near Pottstown. It is part of the Hopewell Big Woods. It is open to the public daily without charge. Welkinweir was the home of Everett and Grace Rodebaugh, founding members of the conservation-minded Green Valleys Association, who bought the site in the 1930s and spent decades improving it. Their house was built in 1940, building upon a much smaller house, built in two sections c. 1750 and c. 1830. The architect Fridtjof Tobiessen designed the 1940 mansion. The property was placed into a conservation easement in 1976, donated to the association in 1997, and is now its headquarters and educational center. In 2001, the estate was listed on the National Register of Historic Places. Its arboretum includes cherry, dogwood, dwarf evergreens, franklinia, magnolia, Japanese maple, swamp and sugar maple, and sweetgum, as well as azaleas and rhododendrons. See also List of botanical gardens in the United States References External links Welkinweir - official site Green Valleys Association Arboreta in Pennsylvania Botanical gardens in Pennsylvania Parks in Chester County, Pennsylvania Houses on the National Register of Historic Places in Pennsylvania Colonial Revival architecture in Pennsylvania Houses completed in 1940 Nature centers in Pennsylvania Houses in Chester County, Pennsylvania National Register of Historic Places in Chester County, Pennsylvania Protected areas of Chester County, Pennsylvania 1940 establishments in Pennsylvania