In the last three years, police have found:
- 5,120 cannabis factories in the North West
- 345,000 cannabis plants.
- All that has a street value of £140 million
Merseyside Police made 11 arrests and seized nearly 1,200 cannabis plants on the first day of a month long crackdown on cannabis growing.
Police have promised to weed out cannabis farms after more than 5,000 were discovered in north-west England.