Gardaí in Carlow have uncovered what they describe as "a fully operational grow house" this evening.
Officers found the grow house on a premises in Killendmond, Borris, Co Carlow.
During the search of the "highly sophisticated grow house" they found cannabis plants worth around €250,000.
They have also arrested a man in his 20s who is being held at Carlow Garda Station under Section 2 of the Criminal Justice (Drug Trafficking) Act, 1996.
The house has been sealed off for a forensic examination.