A farmer has revealed the identity of a mystery purple crop that has left people guessing on social media.

Trevor Edgley, who runs the Nightlayer Leek Company in Chatteris, Cambridgeshire, found himself unable to drill wheat due to persistently wet fields during the spring.

He said he planted a special seed mix on land off the A142 between Chatteris and Mepal - called NUM3 - which encourages insects and wildlife.