sorry to inform you but you and most of uk are the victims of a measurement conversion error. for corn spacing between plants in rows should be 18 cm not 18 inches and 18 in between row 45 cm or 7 in between plants in row and 18 in between rows if you row planting.
also i was suggesting people in uk grow early varieties
Posts
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Mornington Crescent 🏆
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
https://archive.org/details/goodgardeninggui0000lark/page/178/mode/1up
here is uk source that proves my point that corn can be
planted 12-15 in apart by well know UK gardener and author
joy larkcom
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I live in west central Scotland - not where that photo is...