Section R. 285.623.107 - Grading and blendingRule 107.
(1) Each variety shall be graded so as to conform to screen sizes as recommended by the official certifying agency and approved by the director of the department of agriculture.(2) Two or more lots of certified seed of the same variety, strain, or hybrid may be blended if previously approved by the official certifying agency. The quality represented for the blend shall be that of the least desirable lot in the blend, unless 2 unrelated composite samples that are taken by the official certifying agency show the blend to be uniform.Mich. Admin. Code R. 285.623.107