A cutting is taken from the Holy Thorn at St John's Church every year and sent to Her Majesty The Queen. It takes pride of place on her dining table at Sandringham on Christmas Day.
The Homy Thorn is said to be a descendant of the Thorn which is reputed to have grown from Joseph's staff when he planted it in the ground here. He was a trader and 2,000 years ago it would have been possible to sail to Glastonbury.
The Thorn is said to be unique in that it flowers and bears berries at the same time and does it twice a year.
Building houses on a flood plain is always a contentious issue, especially after what happened on the Somerset Levels last winter, but it's nothing new. Archaeologists have been looking at a site at Glastonbury where they did just that, more than 2000 years ago.
Glastonbury Lake Village was built on a man made island in the wetlands and it's been very well preserved.
Archaeologists Bob Croft and Richard Brunning told us more:
Archaeologists have been digging at the site of a 2,200 year old Iron Age settlement in Somerset.
Glastonbury Lake Village is one if Britain's best preserved sites from the era. It was last excavated over a hundred years ago.
Rudimental's Glastonbury set has been cut short by a thunder and lightning storm that hit the Pyramid Stage as they were performing.
Organisers were forced to pull the plug on the London drum 'n' bass act after the storm interrupted their rendition of Waiting All Night.
Police have confirmed that a man who was taken ill after taking drugs at Glastonbury Festival has died.
The 26-year-old was taken to hospital after a suspected reaction to the class B drug ketamine. Officers say his family has been informed.
The music gets underway on the main stages at the Glastonbury Festival later. The weather has taken a turn for the worse, with more rain forecast for today and Saturday. But one of the headline acts, Dolly Parton, says she's looking forward to performing whatever the weather.