Plant is the second eldest child and son in a family of six children. His parents are John William Albert Plant, a farmer, and Catherine Hayden.
One Sunday in 1916 George and his older brother Jimmy are arrested by the Royal Irish Constabulary (RIC) after being seen speaking to two well known republicans, Seán Hayes and Dan Breen. In custody the two brothers are beaten and mistreated resulting in a hatred of the RIC. He serves with the Irish Republican Army during the Irish War of Independence and with the Anti-Treaty IRA in the Irish Civil War.
In 1923 George and Jimmy leave Ireland for Canada and the United States but continue as active IRA members. In 1929 they return to Ireland and carry out a bank raid in Tipperary on behalf of the IRA. They are arrested two days later at the family farm and subsequently sentenced to 7 years in prison. They are released in a general amnesty after the Fianna Fáil and Éamon de Valera election victory in 1932. He is a strong supporter of Seán Russell. In 1939 following the outbreak of World War II, known in Ireland as The Emergency, de Valera is determined to maintain Irish neutrality and is not going to allow the IRA to jeopardize this. The IRA links with Germany and campaign in Britain are severely straining Anglo-Irish relations so emergency legislation is introduced.
Russell, the IRA Chief of Staff, dies in August 1940 after taking ill on board a U-boat and Stephen Hayes from County Wexford becomes IRA Chief of Staff. In late August 1940 an address on Lansdowne Road Dublin is raided by the Garda Síochána. Among the men arrested is Michael Devereux, a 24-year-old married truck driver from County Wexford who is also Quartermaster of the IRAs Wexford Brigade. He is released after three days without charge. Shortly afterwards Gardaí in County Wexford find an IRA arms dump. Many in the IRA suspect that Devereux had turned informer, so Stephen Hayes orders Devereux’s execution. George Plant and another man, Michael Walsh from County Kilkenny, are ordered to carry out the order. Devereux meets Plant and Walsh who tell Devereux that Tom Cullimore, the Wexford Brigade’s OC is blamed for the arms dump and that they have shot him. They order Devereux to drive them to an IRA safe house at Grangemockler in south County Tipperary. Devereux, believing he is the prime suspect in a murder, stays willingly at the safe house. A week later, on September 27, 1940, Devereux is invited to go for a walk with Plant and Paddy Davern, the owner of the safe house. Somewhere along the walk Plant accuses Devereux of being an informer and shoots him dead. Plant is arrested nine weeks later on suspicion of IRA membership and brought before the Special Criminal Court in Dublin. On February 10, 1941 Radio Éireann broadcasts a radio appeal for Michael Devereux on behalf of his wife.
In September 1941 Stephen Hayes is accused of being an informer by a group of Northern IRA members led by Seán McCaughey. He manages to escape to a garda station. Shortly afterwards a large force of Garda Síochána and Irish Army descend on the area around the Davern farmhouse where they find Devereux’s car buried under an onion bed and eventually discover Devereux’s body, a year to the day after his death. Two weeks later, Plant, already in prison on IRA membership charges, is charged with Devereux’s murder. A trial is held with a senior IRA officer, Joseph o’Connor, also charged with Devereux’s murder. The first trial collapses after two days when Paddy Davern and Micheal Walsh, two of the prosecution witnesses, refuse to give evidence. This result leads to the court issuing a nolle prosequi order which should have meant the end of the affair, however both men are rearrested and recharged with the same offence, under Emergency Order 41f. Minister for Justice Gerald Boland transfers the case to a Special Military Court with army officers acting as judges. In addition to Plant, Paddy Davern and Michael Walsh are also now charged with Devereux’s murder. The second trial begins at Collins Barracks, Dublin in February 1942 with Seán MacBride, a former IRA Chief of Staff and future government minister as the defendant’s barrister. Davern states his original statement was given at gunpoint but under the new order even statements given under duress are admissible. The court only has two sentencing options – death or acquittal. Joseph O’Connor is acquitted and despite MacBride’s best efforts the other three are sentenced to death. Davern and Walsh have their sentences commuted to life imprisonment, and are both released in 1946.
Just one week after sentence is passed, Plant is executed in Portlaoise Prison by a six-man firing squad drawn from the Irish Army. Much bitterness is caused by the treatment of Plant’s relatives. Neither his wife or mother or infant son are allowed to visit him in the week before his execution. Censorship ensures there is little mention in the newspapers so his family only learns of his execution from a brief radio broadcast shortly before they receive a telegram. He is buried in the grounds of Portlaoise Prison, but is reinterred in 1948, when he is buried with full IRA military honours in his local church St. Johnstown in County Tipperary, and a Celtic cross is erected over his grave.
Plant’s wife moves to the United States where she remarries. His brother Jimmy dies in London in 1978. The Plant’s family farm is now part of the Coolmore Estate.