 Garner made his Watford debut as a substitute in a 2–0 away win against Reading, replacing Marvin Sordell, on 10 September 2011.His first start came on 24 September 2011 against his old club Nottingham Forest, a game which Watford lost 1–0.His first and only goal for the Hertfordshire club came in a 2–0 away win at Millwall on 31 January 2012.