This time around the grapes in the seven-and-a-half-acres vineyard were picked last week and it is hoped that it will result in 4,000 bottles, split down the middle into red and white wines.
Lesley Dawe, who runs the vineyard with her husband Ken and their son Paul, said normally it would be hoped to harvest enough grapes for 23,000 bottles.
'The vines are reliant on the weather but last year's dreadful summer had a knock-on effect,' she said.
Old Walls Vineyard was planted in 2002 and in 2006 around 25,000 bottles of wine were produced.
The majority of the wine is sold from the vineyard's shop and tea-room, while there are other outlets at local farm shops and restaurants.