Let's see if I can remember my corn genetics.
There are three types of sweet corn. Su, Se & Sh.
The Su is a standard sweet corn, it is the older varieties and the sugar in the kernel rapidly changes to starch, as the corn gets older or very shortly after it is picked.
The Se types are also known as sugary enhanced. They contain more sugar in the kernel, age better and don't starch up as rapidly after picking. The problem with them is that they have a tender kernel and are subject to bruising in picking and shipping.
The last one is Sh, which is for shrunken gene and shrunken gene^2. These have a very small seed, which tends to rot in the ground, so they need to be planted later in a warm soil and fungicidal treatment of the seed is important for seed survival and germination.
The first two types can be planted together without ill effects, however the Sh or shrunken gene varieties need isolation from the other types (and field corn, too). Just check the catalog or the web site for Stokes Seed and see what types you are planting. If any are Sh, you will need to isolate them from other types. If I remember correctly, 200 feet is needed for isolation.
Hope this helps and that I remember all that correctly. It's been a long time since my college days and since I was planting major stands of corn.
By the way, with the Se and Sh varieties plant and row spacing is important to insure larger ears and getting two ears per plant. Rows need to be 36" apart and plants 12" apart in the rows. This will allow for the best germination and development of the ear.
Good luck and if this works send me a dozen ears.
Turfman