But soon after moving in, a neighbour asked Nathan whether Japanese knotweed had been discussed during the sale. He said the seller answered "no" to the knotweed question on the TA6 Property Information Form - the document used to give buyers information about a home. Maurice Ffelan, 82, of the Friends of Blackburn Old Cemetery, said: "It's a bugger to get rid of. The company says it provides Britain's most comprehensive picture of Japanese knotweed. Emily said: "Japanese knotweed remains a serious issue because it does not respect boundaries.