Gardai in Dundalk have seized 200 cannabis plants worth €160 thousand euro.
Cannabis herb with a street value of 50,000 euro was also seized.
It follows the search of a house on the Caste Road in the town this afternoon.
Gardai say they've uncovered a sophisticated cannabis cultivation grow house - after stopping a car whose occupants were acting suspiciously.
Two men in their thirties have been arrested and are being held at Dundalk Garda Station.