Plowden married Emily Frances Ann Bass (1841–1915), the eldest daughter of Michael Thomas Bass Jr., MP for Derby and his wife, Eliza Jane Arden. Emily was the sister of
Lord Burton and
Hamar Alfred Bass. The Plowdens lived at Aston Rowant House, Oxfordshire, and at 5 Park Crescent, Portland Place. They had a daughter, Margaret who married Hubert Mostyn, 7th
Lord Vaux. ==Publications==