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Image: Prince Charles And Camilla, Duchess of Cornwall
Chris Jackson  /  Getty Images
Camilla, Duchess of Cornwall, and Prince Charles, Prince of Wales, burst into laughter as they watch a comedy performance during a visit to “The Garden Party to Make a Difference” at Clarence House on Friday in London.
TODAY.com
updated 9/16/2010 5:13:45 AM ET 2010-09-16T09:13:45

Prince Charles has opened the gardens at his official London residence to the public for the first time to host a sustainable living fair, but uninvited guests have already created a nuisance.

"The rats have become more of a problem," a source at Clarence House told The Sun newspaper. "There seem to be more — and they are getting bigger."

The 12-day Garden Party to Make a Difference kicked off last week, with the aim of showcasing the royals' green lifestyle efforts, while providing space for more than 100 exhibitors and celebrities to share their expertise on everything from green architecture to bee-friendly gardening, Britain's Daily Telegraph reported.

Slideshow: The life and times of Prince Charles (on this page)

But the rats seem to have upset the eco world order.

"We've lost strawberries and our tomatoes got nibbled overnight," one stallholder grumbled to The Sun.  "It's all down to the rats."

The fair at Clarence House is part of the Prince of Wales' larger initiative to promote green living.  Prince Charles has long been involved in sustainable efforts and the promotion of organic farming and ecological conservation.

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But staff are struggling to find a solution that's both effective and environmentally friendly.

"Because we're organic we can't get rid of them by using too many rat killers," the Clarence House source told The Sun.

Located in central London, Clarence House is the official residence of Prince Charles, his wife Camilla and Princes William and Harry.

Slideshow: The lives of princes (on this page)

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Photos: The life and times of Prince Charles

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  1. Queen's first-born

    Prince Charles was born at Buckingham Palace, the London home of Britain's kings and queens, on Nov. 14, 1948. Here, the future Queen Elizabeth II holds the young prince after his Dec. 15 christening ceremony at the palace's music room, where he was baptized using water from the River Jordan. (PNA Rota / Getty Images) Back to slideshow navigation
  2. A sister for Charles

    Elizabeth stands with her husband, Prince Philip, and their children Prince Charles and Princess Anne at Clarence House, the royal couple's London residence, in this August 1951 photo. Anne had been born a year earlier. (AP) Back to slideshow navigation
  3. Polo, here we come

    In 1952, Charles' mother became Queen Elizabeth II. Here, she is seen, right, with the prince and Countess Edwina Mountbatten as they arrive at a polo match in Malta. Charles was to become an accomplished polo player later in life. (Hulton Archive / Getty Images) Back to slideshow navigation
  4. Oh boy, more horses

    In 1960, Charles took part in other equestrian events, including foxhunting and was a frequent attendee at horse events. Here, he strides down the sidelines at the at the Badminton Horse Trials, a premier event held at the Duke of Beaufort's Gloucestershire estate. (Hulton Archive / Getty Images) Back to slideshow navigation
  5. Vroom, vroom!

    In 1965, Prince Charles gained another sibling, Prince Andrew. Here, the pair are seen with Princess Anne as they try out motorized go-karts. (Hulton Archive / Getty Images) Back to slideshow navigation
  6. Sweet on polo

    Prince Charles stands behind a horse during a 1966 polo match in Jamaica. He was to play competitively until 1992, when a series of injuries forced his retirement. He continued to participate in charity games until 2005. (Harry Benson / Getty Images) Back to slideshow navigation
  7. Feather in his cap

    As heir to the British throne, Charles was showered with a string of titles and honors, including being named the Prince of Wales at age 9. Here, he is seen in June 1968 after being installed as a Knight of the Most Noble Order of the Garter in a ceremony at Windsor Castle. (Fox Photos / Getty Images) Back to slideshow navigation
  8. Serious side

    As he approached his 21st birthday, Charles took on an increasing number of official duties. Here, he visits the Tilbury Docks, a run-down area in East London that was undergoing restoration, in August 1968. (Fox Photos / Getty Images) Back to slideshow navigation
  9. Media spotlight

    With increased responsibilities, Charles was thrust further into the media spotlight. Here, he sits down for a June 1969 interview with British television presenter David Frost for, "A Prince For Wales," a documentary anticipating his investiture as the Prince of Wales. (Fox Photos / Getty Images) Back to slideshow navigation
  10. Now it's official

    Queen Elizabeth II places the coronet of The Prince of Wales on her son's head during his July 1969 investiture ceremony at a castle in Wales. (Central Press / Getty Images) Back to slideshow navigation
  11. The love that never died

    Around 1970, Charles met Camilla Shand, a relationship that was seen as an unsuitable match by palace staffers and other members of the royal family. (They are pictured at a polo match during this period.) Shand went on to marry Andrew Parker Bowles and Charles eventually married Diana Spencer. However, Parker Bowles and the prince stayed in touch, eventually resuming their romantic relationship. (Serge Lemoine / Getty Images) Back to slideshow navigation
  12. It's a hat, not a wig

    The prince wears a bearskin hat in his role as Colonel in Chief of the Welsh Guards during a July 1975 Trooping Of The Colour ceremony at Horse Guards Parade in London. (Serge Lemoine / Getty Images) Back to slideshow navigation
  13. Mourning a mentor

    Charles and his father, Prince Philip, attend the funeral of Earl Louis Mountbatten, an uncle and mentor who was assassinated by the Irish Republican Army in 1979. (Fox Photos / Getty Images) Back to slideshow navigation
  14. Past girlfriend, future wife

    In the summer of 1980, Prince Charles began a relationship with Lady Diana Spencer, seen at right with Camilla Parker Bowles, with whom Charles had stayed in touch. Charles and Diana became engaged in February 1981. (EPA via Sipa Press) Back to slideshow navigation
  15. Happy couple

    Charles and Diana pose for the cameras outside Buckingham Palace after announcing their engagement in February 1981. Charles looks taller than his fiancée in this picture, but that's because he's standing on a higher step -- he was actually half an inch shorter than his future wife. (Hulton Archive / Getty Images) Back to slideshow navigation
  16. Sealed with a kiss

    On July 29, 1981, Charles and Diana were married in a glittering ceremony at London's St. Paul's Cathedral, an event watched on TV by about a billion people. Here, the prince and his new princess kiss on the balcony of Buckingham Palace. Charles' mother stands at right. (Hulton Archive / Getty Images) Back to slideshow navigation
  17. The honeymooners

    No Caribbean beach for Charles and Diana's honeymoon; instead, it took place at Balmoral, the royal family's home in the Scottish highlands. Here, the couple relax on the banks of the River Dee, which flows through the 50,000-acre Balmoral estate. (Hulton Archive / Getty Images) Back to slideshow navigation
  18. And baby makes three

    The Prince and Princess of Wales great well-wishers and the press on the steps of St Mary's Hospital, London, as they introduce their newborn son, William, who was born on June 21, 1982. Charles was reported to be the first father in the British royal family to be present at his children's births. (Princess Diana Archive / Getty Images) Back to slideshow navigation
  19. Billy the kid

    Charles and William at Kensington Palace, London in December 1982. Kensington Palace was the residence granted to him by Queen Elizabeth II, who lived at nearby Buckingham Palace. (Keystone / Getty Images) Back to slideshow navigation
  20. The spare

    In September 1984, Prince William was joined by a brother, Prince Harry. The siblings were known, cheekily, as "the heir and the spare." Here, Charles and Harry walk in the grounds of Highgrove House, the prince's country home in Gloucestershire. (Tim Graham / Tim Graham/Getty Images) Back to slideshow navigation
  21. One-handed golf on horseback

    An accomplished polo aficionado, Charles played the game as often as his royal duties allowed. Here, he is seen in action as a member of the Diables Blues team at Cowdray Park in Sussex, England, in August 1985. (Slim Aarons / Getty Images) Back to slideshow navigation
  22. Putting on a brave face

    Princes Harry and William stand between their father and mother as they attend a parade in London in August 1995. By this time, the couple had been estranged for almost a decade, the prince living mostly at Highgrove and the princess at Kensington Palace. They were divorced a year later. (Johnny Eggitt / AFP - Getty Images) Back to slideshow navigation
  23. On Aug. 31,1997, Diana was killed in a high-speed car accident in a road tunnel in Paris, France, along with companion Dodi Al-Fayed and their driver. Here, Diana's brother, Charles, her sons and her former husband stand as her coffin is paraded through the streets of London. An estimated 2.5 billion people watched the funeral on TV, making it the most watched event in history. (Jeff J. Mitchell / AFP - Getty Images) Back to slideshow navigation
  24. Farewell to a beloved grandmother

    Prince Charles stands vigil beside the coffin of his grandmother, Queen Elizabeth (who was usually known as the Queen Mother) as it lies in state in London on April 8, 2002. Charles was particularly close to his grandmother, known for her sunny disposition as well as her defiance of the Germans during World War II. She was 101 when she died. (Adrian Dennis / AFP/Getty Images) Back to slideshow navigation
  25. Your skirt looks nice

    After the deaths of Diana and the Queen Mother, Charles' longtime love, Camilla Parker Bowles, came more into the spotlight and eventually moved into Charles' household in 2003. Here, the couple are pictured at a highland games event in Scotland in August 2004. (Christopher Furlong / Getty Images) Back to slideshow navigation
  26. What the papers said

    Photographs of Prince Charles and Camilla Parker Bowles dominate the front pages of British daily newspapers following the announcement of their engagement on Feb. 10, 2005. (Scott Barbour / Getty Images) Back to slideshow navigation
  27. A wedding blessed

    Because they were both divorced, Charles and Camilla were married in a civil ceremony on April 9, 2005. Immediately following the marriage, their union was blessed at St. George's Chapel in Windsor Castle, where this photo was taken. (Chris Young / Pool via Reuters) Back to slideshow navigation
  28. Wedding album

    The official wedding photo shows Charles and Camilla with their families at Windsor Castle. Left to right, back row: Prince Harry, Prince William, Tom and Laura Parker Bowles. Left to right, front row: Prince Philip, Queen Elizabeth II and Camilla's father, Major Bruce Shand. (Pool / Getty Images) Back to slideshow navigation
  29. He's in the army now

    Charles sits for a group picture after presenting campaign medals to soldiers from the Black Watch on Jan. 20, 2010, in Fort George, Scotland. The regiment lost five soldiers during its seven-month tour of Afghanistan. (Jeff J Mitchell / Getty Images) Back to slideshow navigation
  30. Don't fence me in

    Charles visits a Polish bison reserve on March 16, 2010, during a three-day trip as part of a tour of Eastern Europe. As his mother, born in 1926, reduces her public duties, Charles is expected to increase his role in representing the royal family. (Chris Jackson / Getty Images) Back to slideshow navigation
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  1. Image: Baby Prince
    PNA Rota / Getty Images
    Above: Slideshow (30) The life and times of Prince Charles
  2. Harry Playroom Kensington Palace
    Tim Graham / Getty Images
    Slideshow (36) The lives of princes
  3. Image: Britain's Queen Elizabeth smiles at the Epsom Derby as she speaks with Prince Andrew in Epsom, south of London
    Andrew Winning / Reuters
    Slideshow (39) Life of a queen - Life of a queen
  4. Image:
    Chris Radburn / PA via AP
    Slideshow (63) Life of a queen - Royal style
  5. Slideshow (31) Life of a queen - Crown jewels: Greatest royal head gear

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