Police discovered a "mini-jungle" of cannabis plants in a raid in a quiet city street.
Dozens of the plants were found growing in the garden of a house in Vale Road, Portslade, yesterday.
Some had reached up to 9ft tall and were being grown in pots and in the ground.
Drugs squad officers raided the terraced house at 3.30pm after being tipped off that the garden was being used to grow cannabis.
The occupants were arrested and were today helping police with their investigation.
The plants were taken to Hove police station where they will be stored as evidence.
Inspector Mark Powles said: "A large number of cannabis plants were seized after we were told that they were growing in the back garden.
"We are still sorting out how many of them they are and what they are worth."
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