Answer: The standard recommendation is to have at least 2 weeks between maturity dates, so you should be alright. To add a few extra days, you could stagger the planting times slightly--plant the 58 day variety, plant the 72-day variety a few days later, and the 86-day a few days after that. But you'll probably be fine even if you did plant on all the same day.
Isolation means planting the different varieties at least 250 feet away from each other.
If super-sweet corn varieties are pollinated by standard cultivars, the result can be tough and starchy kernals.
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