se & sy = Sugary Enhanced and Synergistic: The next generation after su or an increase in sugars with the benefit of the traditional corn flavor, often very creamy in texture. Breeders have enhanced the se class with additional sugary kernels and created a new class, sy Synergistic. These varieties are branded as Synergistic, Augmented, Triple Sweet and Synergistic Plus. They taste best when eaten within 2 days of picking. Medium sized seed with generally good emergency in tough conditions. Isolation is required for kernel color but not for taste however sugars are enhanced if isolated.
sh2 & shA = Supersweet and Augmented Supersweet: Leaps above se for sugars. These varieties have the ability to hold in the field for several days as well as hold in cold storage for an extended period of time because the sugars convert to starches very slowly. Breeders have branded these enhancements in sugars and tenderness of pericarp with names like Xtra-tender, Reserve, Augmented and Augmented HQ. Isolation is required for kernel color and taste. If these are not isolated from all other corn types the sugars will revert to starch and produce an ear similar in taste to field corn. Increased sugars in the kernels perpetuate smaller seed size or higher seed counts per pound.
su = Standard: Traditional varieties that started the sweet corn revolution, these have been on the market for years. They taste best when eaten within hours of picking. Less sugar per kernel with very limited storability. Larger sized seed for good emergency under tough conditions. Isolation required for kernel color but not taste.
In order to avoid cross pollination, all corns need to be isolated from each other if you are planting different colors and different types. Isolation options are as follows: 250 feet between variety plantings, 10 days between maturity, a completely separate field, OR a physical barrier.
Please note that untreated seed may have increased chance of poor stand establishment and crop failure. Growers must assume all risk connected with lack of seed treatment.