Welkinweir is a 197-acre (80 ha) nonprofit arboretum, garden, mansion, and conservation area that is located at 1368 Prizer Road, East Nantmeal Township, Pennsylvania, United States.

[2] Situated near Pottstown, it is part of the Hopewell Big Woods and 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.

[3] The property was placed into a conservation easement in 1976, donated to the association in 1997, and is now its headquarters and educational center.

Its arboretum includes cherry, dogwood, dwarf evergreens, franklinia, magnolia, Japanese maple, swamp and sugar maple, and sweetgum, as well as azaleas and rhododendrons.