The PR campaign is financially supported by members of the British Onion Producers' Association (BOPA) - including packers, processors and growers.
It was set up by BOPA two years ago to promote the health benefits of British onions and to encourage consumers to purchase the vegetable more frequently.
Sputnik Communications has carried out the campaign on behalf of BOPA, creating consumer website www.britishonions.co.uk.
The campaign mainly involves placing stories in newspapers, magazines and broadcast media.
BOPA chairman Jonathan Tole told Grower that this year's tough economic conditions meant many firms were unable to offer the cash needed to keep the campaign running effectively. In an appeal to the industry, he said: "Any support would be greatly appreciated."
Sputnik said in a statement: "The coverage generated by the campaign has exceeded expectations (but) a lack of funding may mean a reduction in the level of PR activity - or, in the worst case, that the campaign will be withdrawn."
It added: "It takes time to build relationships with the media. The British Onions campaign ... has been much more successful than we first imagined and we're now in a strong position ... it would be hugely disappointing if we couldn't move forward because of funding issues."
- To make a donation call Jayne Dias on 01507 602427 or email firstname.lastname@example.org.