The Greens will today mark the 10th anniversary of the party's entry to Parliament.

In 1999, special votes counted after the general election put Jeanette Fitzsimons into Parliament as MP for Coromandel and the Green's party vote was finalised at just over the 5 percent threshold.

"Ten years proves we're a lasting feature of the political landscape," co-leader Russel Norman said.

"We've been around long enough to see a second generation of MPs start to join our caucus, there are new faces and new energy but the same values."

The Greens have nine MPs in Parliament.

Dr Norman said some of the most important accomplishments during the past decade were the home insulation fund that has upgraded 20,000 houses this year, the party's negotiations with the previous government to make electrification of Auckland's rail system possible and changing the Crimes Act -- the law that banned smacking -- to help keep children safe from violence.