The Green Party is celebrating the 10th anniversary of its entry to Parliament.
Then-leader Jeanette Fitzsimons won the seat of Coromandel in 1999, and the party vote was finalised at just over 5%.
A decade later, the Greens have nine MPs in the House based on 7% of the vote.
Green Party co-leader Russel Norman says sticking to its values is the secret to success.
He says the party will continue to push for sustainability, fairness, peace and democracy and in turn, grow its support base.
Norman says the Greens have championed the environment and worked to keep the old parties honest.
He says while making a significant contribution in terms of policy, they've also improved the culture of Parliament by making it a slightly more constructive place than it was before.
Otago University's Dr Bryce Edwards says the Greens have changed a lot since they first entered Parliament, with the last campaign showing off a slick and professional new image.
He says they don't stress radicalism any more and tend to take a middle of the road path, with a focus on environmental issues.