The Green and National parties are ramping up their attacks on each other, with the Greens co-leader Russel Norman saying the Prime Minister has become divisive.
The Greens are holding their annual conference in Christchurch this weekend with the theme of local democracy.
The party is encouraging more Green candidates to stand in the local elections, now just a few months away, and next year's general election is also looming large.
Prime Minister John Key says the election will be fought between the centre-right led by National and the far left, with Labour pulled to the left by the Greens.
In parliament, Mr Key has called the Labour-Greens opposition the devil-beast.
The Green Party co-leader, Metiria Turei, says John Key is in a state of mild hysteria, while her co-leader Russel Norman describes him as divisive and vitriolic.
Dr Norman says the best strategy for the Greens is to stick to the issues.