"At the moment it says, Grown in Hawke's Bay, but we would very much like to say, Grown in GE-free Hawke's Bay."
He supported Hastings District's Council's declaration of a GE-free district, which was being contested in court by Federated Farmers.
When he first started farming 40 years ago with wife Jules "it was all about production".
"Now it's about marketing."
He said if markets wanted GE-free food "then I don't want mine contaminated from across the fence".
Mr Seymour said he had no "hard and fast rule" on the science of genetics but he was against the proposed RMA changes. It centralised power which led to poor decisions, added red tape and required more consultation with iwi "which personally I think is deeply offensive despite my Ngapuhi roots".
He predicted a National-led government after the next election, hopefully in coalition with ACT.
The experiences of previous governments' coalitions with New Zealand First and its leader Winston Peters were "like being in bed with a gorilla - "you don't stop when you're tired".
The present government "was far too smart" and an alternative was "a resurgent ACT Party".
Mr Seymour also met with Te Aranga Marae representative Henare O'Keefe to discuss its social housing proposal in Flaxmere using Housing New Zealand houses.
Mr Seymour said he last met Mr O'Keefe in Canada where Mr Seymour worked for a think tank.