Madestein UK, a member of the British Leafy Salads Association, will have a chance to put is case at the enquiry, scheduled for 27 February to 8 March.
Local campaign group the Almodington Association has raised more than £80,000, enabling it to engage a barrister to put the case against. The Campaign to Protect Rural England will also speak in opposition.
Almodington Association chairman Andries de Vaal said: "There are significant grounds on which we can fight this appeal.
"It is against planning policy, it will upset the visual attraction of the landscape and there would potentially massive increases in HGV movements."
Madestein UK declined to comment.