More than five million cranberries will be floated on a pond in Kew Gardens next month to recreate the wet cranberry harvest that takes place in the US.

Growers' co-operative Ocean Spray is to ­recreate the New England harvest between floating booms in the pond in front of Palm House at the Royal Botanic Gardens. The event is being timed to coincide with the US harvest and will form the centre­piece of Ocean Spray's sponsorship of Kew's Autumn Harvest Festival from October 7-29.

Grower-owners from the Ocean Spray co-operative will attend the launch to explain the harvesting ­process and a cranberry exhibition will run until Christmas in the Princess of Wales Conservatory.

RBG Kew head of marketing Tina Caine said: "This is the first time cranberries have featured in the autumn festival and we expect visitors to be intrigued."

The Kew sponsorship is part of £10.2m support for Ocean Spray this year.