The force executed a total of 21 warrants and seized 1180 plants along with the arrests that were made.
Two large cannabis farms, totalling around 500 plants, were found in Anfield and Southport.
Force across the North West have launched a month of action against those who cultivate cannabis, and have appealed for help from the public in identifying cannabis farms in the region.
Alongside a checklist of suspicious activities the public should look out for, police are working with DIY retailers and garden centres so any large purchases of fertiliser or horticultural equipment are reported to police.
Superintendent Mark Harrison of Merseyside Police said: