The pitch for the first football match to be played at Buckingham Palace was prepared by Wembley groundsman Tony Stones.
The match, held on Monday, was arranged by the Duke of Cambridge, who is president of the Football Association, as part of the FA’s 150th anniversary celebrations.
Stones supervised a month-long regime of overseeding, top-dressing and fertilising to get the Queen's lawn into shape.
He said: "It's not up to international standard because there are too many undulations and it slopes to one side so that it drains into the pond, but it's probably the best Sunday league surface these guys have played on."
Stones cut the grass to 26mm rather than Wembley's 23mm "to give it some extra protection".