Officers are still searching for the suspect.
Sergeant Glenn Moore said information led investigators to the site where they discovered the mature plants.
Given the amount seized, the suspect would likely be facing charges of cultivating a prohibited plant with intent to sell or supply.
This could mean a hefty fine or jail term.
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Police have released images of a man they believe can help with their inquiries.
Call Joondalup Detectives on 94000957 with any information.