To that end, the party has listed three policy priorities for achieving the Green vision - a child poverty action plan; a clean-up of New Zealand rivers so they are safe to swim in; and the creation of thousands of "green" jobs.
Details of how the Greens see the last two priorities being progressed will be unveiled this month so there is time for the policies to sink in before the country becomes consumed with the Rugby World Cup.
Crucially, the Greens' latest priorities have been framed in a fashion that would make it possible to make progress regardless of whether Labour or National is in power.
The Greens have already worked on a limited case-by-case basis with National under a memorandum of understanding, notably in subsidising the insulation of older houses.
The Greens are clearly flagging a significant expansion of items coming under the purview of the memorandum.
The priority-setting is also driven by the the Greens' tendency at past elections to have too many policies and too little attention given to communicating them effectively.
The party's two co-leaders, Metiria Turei and Russel Norman, are also acutely conscious of the limited "fiscal space" available for new Government spending in straitened times and have accordingly costed the policy priorities.
In other words, the Greens are not putting forward some unattainable and unaffordable policy wish-list. They want to be seen as both realistic and responsible.
National would still gulp at the $1 billion-plus bill over three years for the child poverty action plan. National will not buy an extension of the in-work tax credit to beneficiaries as that would undercut Working for Families' incentives to look for work.
However, National might be more receptive to the other Green suggestions of offering better study assistance for sole parents and beneficiaries or implementing minimum energy standards covering the heating of residential rental accommodation.
Add it all up and the Greens' gambit begins to look a bit like the coalition you have when you do not have a formal coalition.