Grades and Requirements for Potatoes Application 176. The grades and requirements set out in sections 177 to 180 apply to potato varieties grown from Solanum tuberosum, potatoes for seed being excluded. Grades and Grade Names 177. The grades and grade names for potatoes are Canada No. 1 and Canada No. 2. Requirements for All Grades 178. (1) In addition to the requirements for each grade and subject to the tolerances set out in section 181, potatoes of all grades must • (a) be properly p...