A man and woman will face court this month over the alleged cultivation of more than 500 cannabis plants at Marulan and Razorback.
Police said the find came after Hume District officers executed two search warrants on Thursday.
At 9.30am they searched a Tickner Valley Road home, near Marulan.
There they discovered an indoor cannabis crop of 97 plants and an outdoor cannabis crop of 145 plants.
Its estimated street value is $245,000.
A 42-year-old man and 39-year-old woman were arrested and taken to Goulburn Police Station.
Following inquiries, officers attached to Camden Police Area Command conducted a second search warrant at a home on Thurns Road, Razorback.
At that location, a further 281 plants and five registered firearms were seized.
The man was charged with possess prohibited drug, cultivate cannabis (enhanced indoor, commercial quantity), and cultivate cannabis (indictable quantity).
He was refused bail to appear at Goulburn Local Court on Friday.
At that appearance he was granted conditional bail to reappear on Wednesday, February 12.
The woman was charged with cultivate cannabis (enhanced indoor, commercial quantity).
She was granted conditional bail to appear at the same court on Wednesday, February 26.