"This year is proving to be another exceptional one for British-grown blueberries," said Berry Gardens, adding that growers were working full pelt to meet retailers' demand.
The co-operative, with 63 members from East Anglia to Scotland, has a total turnover of £200m, and it said its growers would bring in 350 tonnes of berries.
Managing director Nick Marston added: "Very strong consumer demand this season has rewarded growers' investment in this fruit. Further investment in planting and maturing plants will see tonnage rise to 1,200 tonnes over the next three years."
Peter Thomson, who runs Thomas Thomson in Blairgowrie, said: "This year's berries are particularly big and have excellent flavour."
Ross Mitchell of Castleton Farm in Laurencekirk added: "We are experiencing an earlier than expected crop. The bulk of our harvest will begin in September and we predict very good yields."