When asked whether she would perform the task on her own, the Queen replied: 'No, no, I'm still perfectly capable of planting a tree, ' before picking up the shovel and moving soil onto the plant's roots in an already dug hole.
The Queen has shown her sassy side when offered a helping hand by a well-meaning member of the public during her most recent engagement in Cambridge.
It's not the first time a Royal has planted a tree at the venue. She told Tina Barsby, the chief executive of NIAB that she doesn't drink wine but favors four different types of cocktails.
A long-time worker, Teresa Stratton, told the Lancashire Telegraph that she'd mentioned how "We're the only place in the United Kingdom that does grape research" to The Queen and that she "was very interested" to learn that.
"But she handed her handbag to her someone and seized the spade".
"And she said, 'I don't actually drink wine myself, but I hear it's very good'".
Tree planting duties have always been part of royal tradition.
The Queen toured an exhibition celebrating 100 years of crop research at the institution before planting the tree and unveiling a plaque.
She was greeted by crowds of flag-waving schoolchildren.
During the afternoon, Her Majesty was given a tour of Royal Papworth Hospital at its new site on the Cambridge Biomedical Campus.
The hospital opened as a tuberculosis colony in 1918 in the village of Papworth Everard and was home to the first successful heart transplant in the United Kingdom in 1979.
Speaking prior to the visit, Professor John Wallwork, chairman of Royal Papworth Hospital NHS Foundation Trust, said: "It will be a huge honour to welcome Her Majesty to our hospital on 9 July".
According to Yahoo's The Royal Box, the Queen - who at 66 years on the throne is Britain's longest-serving monarch - may offload some of her duties to her son, Prince Charles, within the next two years.
US, Chinese trade negotiators resume talks
In this Thursday, July 4, 2019, photo, magazines with a front cover featuring Chinese President Xi Jinping against U.S. President Donald Trump, trade war and the South China Sea is placed on sale at a roadside bookstand in Hong Kong.