the nelson garden, on 13 chippenhamgate street, at the rear of no.18 monnow street, monmouth, monmouthshire is a 19th-century garden that was the scene of a tea party held to honour lord nelson in 1802. the garden is one of 24 sites on the monmouth heritage trail. it is bounded on the south by the line of the medieval town wall through which it is entered via a short underground passageway. the garden is open to the public between april and september on friday 2–4 p.m.