Unless by "Baby" sweetcorn, you mean the little mini ones which you stir-fry (I have some called Minipop)? If so, they are harvested when the tassels first show & are still white.

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Sarah

“Tell me one last thing,” said Harry. “Is this real? Or has this been happening inside my head?”
“Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?”