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Wish mine looked that good.When did you plant them?
Normally I would expect this when they were a bit taller but there is nothing to say that cobs won't come from the leaf axils that are there.Give them time and see what happens!You don't give any sowing/planting times so this might have a bearing on the size, plus you don't say if it is just one plant that is affected or many.My opinion; treat them in the manner you would normally treat your plants, who knows the might shoot up over the next few weeks!
They did catch the frost