While a junior in the office of the Commissioner of Agriculture and Dairying for Canada, George Clark recognized the need for an organization established for the purpose of promoting and production and distribution of good seed. Accordingly, he was one of the founders and the first secretary of the Canadian Seed Growers’ Association.

In 1908, Mr. Clark was promoted to the position of seed commissioner. During his tenure of office, he was responsible for drafting several important acts, including the Seed Control Act, the Feeding Stuffs Act, the Fertilizer Act, and the Agricultural Pest Control Act, all of which have had a profound effect upon Canadian agriculture.

During the First World War, he represented Canada on the Seed Stocks Committee of America, a group responsible for arranging for the production of field, root and garden seeds, previously obtained from Europe.

Throughout his career George Clark was a dedicated advocate of good seed and focused attention on this theme by organizing many projects, such as crop competitions and seed fairs.