Herstmonceux (is a village and civil parish in the Wealden District of East Sussex, England. The village (previously called Gardner Street) is part of the larger Herstmonceux civil parish, which includes Cowbeech and the hamlets of Foul Mile, Trolliloes, Cowbeech Hill, Stunts Green, Ginger’s Green, Flowers Green and part of Windmill Hill. Cowbeech village is located to the north-west of the parish. Herstmonceux is twinned with Varengeville-sur-Mer, in Normandy, France.
The name ’’Herstmonceux’’ comes from Anglo-Saxon hyrst, “wooded hill”, plus the name of the Monceux family who were lords of the manor in area in the 12th century.
Herstmonceux Castle (some 2 miles (3.2 km) south-east of the village) is a former site of the Royal Greenwich Observatory. It is now home to the Bader International Study Centre of Queen’s University, Kingston, Canada, and the area therefore enjoys an influx of Canadian and other international students each school year. The castle grounds are also home to the Observatory Science Centre, which is operated by Science Projects Limited, and the Herstmonceux Mediaeval Festival.
There are two sites of special scientific interest within the Parish. Herstmonceux Park is of importance because of its wetland habitat and fen vegetation. It is the only known location of Milk Parsely (Peucedanum palustre) in the south-east. The second site, Pevensey Levels, lies partially in the parish. The site is of biological interest consisting of low-lying grazing meadows, hosting a wide variety of wetland flora and fauna.