What is the most widely cultivated plant? July 7, 2020 by Pamela Landy Wheat, the food base of Western civilization, is by far the most widely grown plant. It has been cultivated for more than 7,000 years in every continent except Antarctica. Related Answers Which continent is the most populous? What are the opening and closing lines to A Tale of Two Cities? What is the origin of the term Witch Hazel? How many continents are there? What is the most widely sung song in the English-speaking world? What is the world’s largest plant?