Cold cobs still fresh-looking green husks and with tassels.
Check that they are free of worm injury.
Cobs with small, shiny kernels are general sweeter and more tender than those with large, deep yellow dull kernels.
Tip#2....Pic fresh, succulent husks with good green color, silk ends that are free from decay or worm injury, and stem ends that are not to discolored.
Avoid ears with yellowed, wilted or dried husks, or discolored and dried out.