Updated 8.09pm: Crucial is how one Green Party co-leadership candidate's viewed today's meeting with party members.

Kevin Hague, Gareth Hughes, Vernon Tava, and James Shaw have all fronted at a public meeting in Auckland this afternoon.

Given the size of the party's Auckland membership, Kevin Hague says it's been a significant event.

"A third of the voters are in the Auckland province, and it's obviously a crucial meeting for us. But right now actually being able to persuade these Auckland voters to vote for me in the co-leadership contest is gold."

Kevin Hague says he has the most experience and passion, and the biggest support base.

James Shaw says that despite appearances, competition is heating up for next month's vote.

"There's a way that we compete which is quite different from the way other parties compete, so it often looks like massive co-operation."

Mr Shaw highlighted his economic credibility with voters.

One contender is prepared to move to Auckland if he takes the top job at the end of next month.

Gareth Hughes plans moving to Auckland to connect with younger voters.

"I believe a co-leader should live here full-time," he said.

The party's faced criticism, both internal, and external, over its representation in the wider Auckland region - neither of the party's current co-leaders are based there.

Currently, co-leaders Metiria Turei and Russel Norman are based in Dunedin and Wellington respectively. 

Vernon Tava wants a total change in direction, saying the Greens have hit a ceiling of 11% - which could change with some party movement.

"As long as we are seen as a left wing party, we're tied to Labour. As long as we're stuck on the left I think that's going to present some very significant challenges."