On November 1, 2005, the center stone of the park was dedicated by Their Royal Highnesses, The Prince of Wales (the Garden’s Royal Patron) and The Duchess of Cornwall.

On May 29, 2009, HRH Prince Henry of Wales planted a magnolia tree and officially christened the park, “The British Garden at Hanover Square.”

In July of 2010, Right Honorable Michael Bloomberg, Mayor of New York, welcomed HM Queen Elizabeth II and HRH Prince Philip, The Duke of Edinburgh to the Garden, on which occasion Her Majesty met the families of the British victims of the September 11 attacks and officially opened the Garden.

In August of 2011, the purpose of the Garden was expanded to honor victims from the Commonwealth nations. Canada and Australia were the first to join.

On May 2, 2012, The Very Reverend Dr. John Hall, Dean of Westminster Abbey formally renamed the Garden “The Queen Elizabeth II September 11th Garden” thus officially dedicating the Garden as the memorial for all the Commonwealth victims of the September 11 attacks, as well as honouring her Majesty’s Diamond Jubilee.