Not sure what the dimensions of the pots are, but for intensive plant spacing for early varieties 6" is recommended; for later varieties 8-10". Not sure if that helps at all. Corn is a really heavy feeder. Pollination should be aided by the close placement of the plants. I plant in circles anymore and can tie the stalks onto a central stake to avoid blow down in heavy winds/storms.
Ambrosia is our all-time favorite, btw!
kath
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