@agoodbeerblog On a boat abandoned at Graveney, Kent (in south-eastern England) at some time in the tenth century AD a cargo of hundreds of hop flowers was found. This is a probable indication that by this
time hops for use in beer brewing were being traded. Certainly the common use of hops in beer would not come for a few more centuries, but its use was probably fairly widespread already by the end of the first millennium.
citation to follow: