Corn agriculture only reached southern Ontario about a thousand years ago, and profound adaptation to a shorter growing season were required. But once the adaptation was made, corn-growing was fundamental to Ontario history 1000 CE to c1820 CE when wheat temporarily took over. Then wheat began to move west c1880. Drive southern Ontario backroads today, and you see that corn is back -- though most of it is silage, "cow-corn," not the sweet stuff.
