GS Designation The GS designation is a special buy for corn producers who will let us decide which seed size goes in the bag. All our seed is sized as usual....but then we can use the GS designation to level our inventory at a great savings to our customers who have plateless planters or who want to select their own plate. Usually, the GS seed is our smallest rounds or flats, but it can be other sizes. All seed meets regular germination, vigor, and purity standards. Simply order as GS.