As a young man, Harry Plant was a noted buckjump rider in north Queensland. In the Townsville show ring he set a world record in 1923 by jumping his horse over a bar 233.7 cm (7ft 8in) from the ground.

Plant then turned to training thoroughbreds, winning both the Queensland Guineas and Derby with Bernfield in 1929.

He moved briefly to Melbourne just before World War II, and then settled in Sydney in 1944 where his association with Bernborough in the post war years made him a national figure.

In 1945 Plant took over the training of Bernborough. After a defeat at his first start, Bernborough went on to win his next 15 in succession. The magnificent sequence was brought to an end with his controversial defeat in the 1946 Caulfield Cup, and breakdown in the Mackinnon Stakes.

Plant trained many other fine horses, such as sprinters Fine and Dandy, Time and Tide and Front Cover. His feature race wins included 4 Doncaster Handicaps, 2 Golden Slippers, 3 AJC Sires Produce Stakes, the Newmarket Handicap, Futurity Stakes, Oakleigh Plate, Stradbroke Handicap and Doomben Cup.

Plant retired from training in 1972 and died six years later.

Harry Plant was inducted into the Hall of Fame in 2010.