It's not just where it's grown, it's also the variety of wheat (e.g. https://ragt-seeds.co.uk/en-gb/nos-varietes?field_specie_code_tid=Winter+Wheat https://ragt

It's not just where it's grown, it's also the variety of wheat (e.g. https://ragt-seeds.co.uk/en-gb/nos-varietes?field_specie_code_tid=Winter+Wheat https://ragt-seeds.co.uk/en-gb/nos-varietes?field_specie_cod...), the seed-dressing used, and a bunch of other variables.