The operation took place on Tuesday last week.
According to information to Kungsbacka-Posten, police have been seen carrying bags out of the yard.
Sonja Seligmann, head of the preliminary investigation, tells SVT Nyheter Halland that it is still unclear whether the men lived on the farm and what connection they have to each other.
It is still unclear how much cannabis is involved, but at present the crime is considered serious.