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I had great success with my sweet corn the first year with decreasing harvests in the three years following, even though I rotated the corn location and interplanted beans and squash. I have never gotten more than two ears per plant. My garden beds are 4' wide raised beds, and I usually plant a 4' x 4' or 4' x 8' block of corn. I plant seeds every 3-4" and thin them to 9-12" apart. My rows are usually 9-12" apart and when thinning I try to stagger the plants so they are all about a foot apart. Pollination was not an issue the first year, but in year two and following we had hot dry weather very early. Sweet corn likes heat but it also likes a bit of humidity. Even when I went out early in the morning to hand-pollinate I rarely found viable pollen. Usually I plant the corn late February-early March. Haven't tried a summer crop, planting at the start of the summer rains. That might work better. I think it is important to use a short-season variety, especially in the spring. That hot dry weather in June shrivels almost everything.