Three men have been arrested in relation to the incident.
Gardai in Laois/Offaly have seized €100,000 worth of suspected cannabis herb in Offaly.
The Laois/Offaly Divisional Drugs Unit and Portlaoise/Tullamore Detective Units made the discovery following the search of a house in Birr.
Three men aged in their twenties, thirties and forties have been arrested in relation to the seizure.
They're currently being detained in Birr and Tullamore garda stations pending further investigation.