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Greens leader James Shaw says he's in the fight of his life as today's 1 NEWS Colmar Brunton poll gives the party its worst result in nearly eight years.
The poll has the Green Party on 4.3 per cent, its worst result since September 2009.
In 1999 the Greens just scraped into Parliament, now, 18 years later, they could be out completely.
"I am in the fight of my life. I am going to take it out to the country over the course of the next few weeks," Mr Shaw said.
"I think if you look at the last 17 years of our record, most people would say that that was a blip," he said of tonight's poll.
The Greens hit a high of 15 per cent in the last 1 NEWS Colmar Brunton poll.
But former co-leader Metiria Turei's shock benefit fraud admission, the hasty departure of two MPs and Ms Turei's eventual resignation has rocked the party and its supporters.
Now sole leader James Shaw is confident his party will bounce back.
"What we've got to focus on is ensuring that there is a new progressive government of New Zealand," he said.
Labour and the Greens' memorandum of understanding remains in place, but do the Greens need more support from Labour to survive?
"We've seen a lot of movement in the polls in recent times. I'm sure that will probably continue," said Labour leader Jacinda Ardern.
National leader Bill English said most of Labour's increase has come from the Greens, "so the Greens have to try and get those voters back from the Labour Party. That might be a challenge for them".
If the Greens don't reach the five per cent threshold, their only other option to get back into Parliament is to win a seat.
The party is putting up a fight in Nelson but is highly unlikely to win there, said 1 NEWS political reporter Katie Bradford.
So its only other option is for Labour to stand aside in an electorate to make way for the Greens, but both parties are ruling that out.
James Shaw says he's "absolutely confident we can rebuild" and the party will now focus on policy.