Early plant breeding, wheat example
Wheat began to spread beyond the Fertile Crescent during the Neolithic period.
By ~ 5,000 years ago, it had reached Western and Central Europe, North Africa and India.
By 4,000 years ago it was known in China.
It was carried by Spanish colonialists to Central and Southern America in the 1500's, by Dutch colonialists to South Africa during the 1600's, by northern Europeans to northern USA and Canada in the early 1700's, and by British colonialists to Australasia in the late 1700's