In uncovered footage of the Cambridges visiting Kate Middleton's Chelsea Flower Show 'Back to Nature Garden' in 2019, George, eight, admired the amazing work. Prince William, 39, asked the young prince to rate Kate's garden design out of ten.

       As the little royal sat on a swing, he charmingly replied: "Twenty out of ten.”

       "That's pretty good, I think mummy's done well," the Duke of Cambridge said.

       "Wow, how amazing is that?" Kate said as she watched George's younger brother, Prince Louis, three.

       Kate, 39, worked alongside Davies White Landscape Architects, Andrée Davies and Adam White, in 2019 to create the Back to Nature Garden.

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       The garden was created to bring people closer to nature and “highlight the benefits of the natural world on our mental and physical wellbeing”.

       The Duchess created it to inspire families to spend more time outdoors.

       The Cambridges visited the garden and released sweet pictures, including Prince Louis taking his first public steps.

       Another picture showed a casual Princess Charlotte swinging from the rope in the garden barefoot.

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       It was intended to have a natural woodland theme including many unique design features.

       In the centre of the garden a high platform tree house can be found, which can be used to get a bird's eye view of the garden.

       “The design includes many natural elements that aim to stimulate active play, promoting the benefits of laying the foundations of physical health from a young age,” the Royal Family website explains.

       “Tree stumps, stepping stones and a hollow log will test and improve children’s balance, strength and co-ordination.

       “The garden hopes to trigger memories of time spent in nature, and encourage others to go out and create new experiences in the great outdoors.”