Greenwell is a 596-acre State Park located on the Patuxent River in St. Mary's County, Maryland. In 1971, John Phillip Greenwell, Jr. and his sister, Mary Wallace Greenwell, donated their 166.6 acre farm to the State of Maryland for use as a public park for everyone. The state subsequently purchased the adjacent 430-acre Bond property and joined the two to form the existing park. The park is managed in partnership with The Greenwell Foundation, a non-profit organization dedicated to providing outdoor accessible recreation. Pets are allowed in Greenwell State Park.Pets are allowed in Greenwell State Park.
A focal point of the property is Rosedale Manor, circa 1880, which is situated on the shoreline of the Patuxent River. The Manor features a Victorian-style rose garden, a family chapel and a spectacular view of the river. The Manor may be rented for events such as weddings, reunions, meetings and conferences. Event support and planning is available for functions with 50 or fewer guests.Every second Sunday of the month the historic Rosedale Manor House is open to the public for tours from 1:00 p.m. - 4:00 p.m.