It has been a nightmare season for farmers, with England said to have had its second-worst harvest on record

Giant orange pumpkins with ghoulish grins have become a Halloween doorstep tradition but this year trick-or-treaters may be greeted with even spookier green-tinged jack-o-lanterns after a nightmare season for growers.

In Asda, pumpkin displays have signs telling shoppers “don’t worry if I’m slightly green, I will ripen at home and turn orange”.