The 'fresh pledge' showed the company's commitment to providing quality fresh produce at affordable prices, said John Sharpe, managing director of central distribution trading & logistics.
He added that the move also supported the government's 5-a-day initiative to improve the nation's health by encouraging consumers to eat five or more pieces of fresh fruit or vegetables a day.
The offer, which started on July 30, begins with 100% extra free on 250g Heritage Select runner beans, rrp £1.49; Heritage Select vine tomatoes at 99p; Heritage plums 500g for £1.19; and peaches and nectarines at £1.19 for eight.
"We are delighted to be able to help consumers get on their way to eating five fresh products a day," said Sharpe.
"The more we can do to help guide consumers into better eating practices through promoting the 5-a-day healthy eating initiative and providing our retailers with a complete fresh range through our central distribution and six-days-a-week Premier delivery service, the better."