The advertising push will give consumers the chance to win a garden makeover as a tie-in in to the brandsí Garden After Hours promotion which ran earlier in the year.
The radio promotion will run in October and November in seven Scottish regions on Clyde 1FM, Forth One, Moray Firth Radio, North Sound One, Radio Borders, Tay FM and West Sound. It will also feature on stationsí websites.
The aim is to persuade convert 45s and overs to try Grantís instead of their usual blended Scotch.
The campaign is part of a £3.8 million investment in the UK in the brand this year.
Brand manager Harriet Knight said: ďScotland is an important market for us. This investment allows us an ideal platform to communicate our brand credentials at this key seasonal period.Ē