Kate Middleton and Prince George
Prince George happily played on the grass with Kate Middleton as Princes William and Harry played a charity Polo match in June Chris Jackson/Getty

Kate Middleton has described Prince George as "noisy brother" of Charlotte while Prince William called his son "lively". And now George's grandfather, Prince Charles, has revealed about the little heir's interest, which lies in being outdoors most of the time.

"He's one of those characters, I think, who naturally, instinctively, likes to be outside," Charles told Sky News of the firstborn son of the Duke and the Duchess of Cambridge. "It's very interesting. I'm intrigued to see if it lasts, but he loves being outside, which is encouraging," the Prince of Wales said in an exclusive interview.

Charles talked about the importance of observing Mother Nature in life. "Like all these things, it depends if you can get them to take an interest," he added.

"But half of it comes from explaining the minutiae of life sometimes, or getting people to look carefully at something, even watching a bird or observing carefully a flower or how a building sits in the environment and the landscape. All of these things are part of the intricate detail and pattern of life, which we can't exist without."

According to a royal insider, George loves gardening along with his grandfather. "George recently helped his granddad plant a balsam poplar tree and a winter orange lime tree," the aide told Us Weekly. "They love to garden together."

The two-year-old is also said to love driving his miniature toy tractor outdoors at William and Kate's home in Norfolk, as revealed by Middleton. The duchess said George was "obsessed" with tractors, combine harvesters and anything with "big wheels", The Sun reported. She said little George was also developing love for helicopters.