For your reference: The reason of maize heading in 5 days is related to maize variety, temperature, plot and cultivation management.

The maize sown in early spring headed a little later than that sown in summer.

it is normal for your corn to head in 5 days.

Please look at the pictures of corn I planted

Take a certain area, a certain variety and a summer sowing variety as an example

Planting on June 2th

Picture on July 1st

On July 1th, the height of corn was 51cm and 8 leaves

On July 2th, the height of corn was 94cm and 11 leaves

On July 3th, the height of corn was 1.86cm and 14 leaves <