Robbie Williams planted a new tree at the King's Sandringham estate as he said farewell to Norfolk following a sell-out weekend.

Van Morrison kicked off the weekend on Friday, followed by two nights of Williams and The Who bringing the curtain down tonight.

Organised by Heritage Live, the company's first staged outdoor concerts at the royal estate attracted 20,000 fans for each of Williams' performances.

Staging gigs at some of England's most beautiful and culturally significant venues, Heritage Live says that its tree planting is just one of several environmentally friendly initiatives it is looking to employ at its summer concerts.

Eastern Daily Press: Williams, 49, planted the tree near one of Sandringham's oldestWilliams, 49, planted the tree near one of Sandringham's oldest (Image: PA)

Speaking on the new initiative, Williams, 49, said: "I'm really honoured to have been asked to plant the first tree during a Heritage Live concert here at Sandringham."

READ MORE: Robbie Williams, Sandringham review: The ultimate showman is fit for a king

Giles Cooper, managing director of Heritage Live, said: "We care very deeply about how our concerts impact the environment and our aim is to become a leading light in how to stage outdoor events and festivals in as eco-friendly and sustainable way as possible.

Eastern Daily Press: William's two-day concert included many of his greatest hitsWilliam's two-day concert included many of his greatest hits (Image: Joe Giddens/PA Wire)

"I am honoured that Sandringham Estate has granted Heritage Live permission to hold these concerts and I'm very grateful to Robbie Williams for planting this first tree during this special night at Sandringham."

READ MORE: Take That fans go wild as Mark Owen joins Robbie on Sandringham stage

Heritage Live concerts are also staged at venues including the Englefield Estate in Berkshire and Audley End in Essex.

The tree that Williams planted was a Liquidambar styraciflua "Rotundiloba", which now sits adjacent to the oldest tree in Sandringham Gardens - a 700-year-old veteran oak located beside the upper lake.

More than 30,000 people have so far attended the three-day-long event at Sandringham, with critics applauding Williams' greatest hits setlist. 

The Who will take to the stage at 8.30pm this evening.