The retailer expects to sell nearly two million pumpkins this season - a 15 per cent rise on last year, and accounting for more than a third of all UK sales.
More than three-quarters will be supplied by Oakley Farms of Lincolnshire. Its commercial director Steve Whitworth said:
"We plant early and then harvest in late August to make sure all the pumpkins are under cover before the colder autumn weather comes. We have invested in industrial glasshouses so that we can keep our pumpkins in perfect condition until they get taken to store."