Greens examining how party decides policy as membership triples under Zack Polanski

Exclusive: Concerns in-person vote system is giving bigger say to organised fringe activists who can attend conference

Senior Greens are examining ways to revamp the party’s structures to make it more effective and representative now its membership has more than tripled since Zack Polanski became leader.

Under the party’s direct-democracy model, policy is voted on only by members who attend one of its two annual conferences, a system some Greens believe risks empowering organised fringe activists who make the effort to travel to the events.