Tran, assisted by an interpreter, pleaded guilty in Whangārei District Court today to cultivating cannabis and possession of it for sale.
Judge John McDonald noted the court could not sentence Tran until a dispute about his level of involvement in the venture was resolved which is to be decided at an upcoming hearing.
Tran's lawyer said his client only arrived at the property a few days ahead of the arrests. He had only gone there to help with harvesting and was not involved any further than that in the operation.
But prosecutor Nicole Jamieson said the Crown had evidence Tran was the principal offender.
Judge McDonald further remanded Tran on bail.
It is understood his co-offenders, Truang Nguyen, 19, Tien Minh Duong, 21, and Thai Ho, 33, have all pleaded not guilty to their alleged roles in the venture. Their cases are still tracking through the court process.