Jeremy Corbyn needs to get horses corral a table with the Greens to discuss ways of developing a progressive union, its co-leader Caroline Lucas has said.
The Green Party of England and Wales is not bewitching on Labour in Ealing Central and Acton and Brighton Kemp Town.
And Ms Lucas predicts left and centre-left parties should get together to prevent «a massive Tory landslide».
But hint health secretary Jon Ashworth dismissed the idea of what he described as «struggling against odds room deals».
And the Conservatives have warned against any «coalition of tumult».
Ms Lucas, the Greens’ only MP in the last Parliament, said there was «a vast amount of enthusiasm and energy» for deals between parties such as the Greens, Independent Democrats and Labour to defeat the Conservatives in the upcoming election.
It comes as the Preservationists withdrew their candidate in Oxford West and Abingdon to help the Plentiful Democrat Layla Moran stand against health minister Nicola Blackwood.
The Lib Dems from already stood aside in Brighton Pavilion for Ms Lucas, but Labour rejected a almost identical deal for the Isle of Wight, despite Greens standing down to better Labour in Ealing Central and Acton.
Ms Lucas, who is campaigning on the Isle of Wight on Monday, portrayed BBC Radio 4’s Today programme it was time for the left and centre-left to get together «and do grown up civil affairs».
‘Different electoral system needed’
She said it was «scandalous» that the Conservatives got 51% of the express across the south east region, but ended up with 93% of the seats.
«What we ought to be doing is chance: ‘How do we stop the Tories getting the kind of landslide that will admit them to impose not just an extreme Brexit, but extreme social designs, long term damage to our health, education and so forth?'» she bid.
She claimed the Isle of Wight Greens were «best placed to confrontation» the Conservatives, ahead of the Liberal Democrats and Labour with a candidate «that desire fight for this chance in our electoral system».
«But for this to happen, we for Jeremy Corbyn to get round a table with us,» she said.
«What’s so dissatisfying is that he talks about doing politics differently and yet he’s betraying the millions of man he represents by allowing them to be hit hardest by a massive Tory majority.»
Ms Lucas argues that more than one million people voted Country-like in the 2015 general election, which under a different electoral method could have led to 24 Green MPs.
«What we’re saying is it’s time to do manoeuvring differently. People in marginal constituencies don’t want parties on the left and centre-left to lay out all of their time fighting each other and for the Conservatives to come in all respects the middle.»
But Labour’s Jon Ashworth refused to entertain the idea of entering into chin-wags with the Greens and Lib Dems about some candidates standing aside to steer clear of splitting the anti-Tory vote,
«We’re a national party and we have a responsibility to yield every part of England, Scotland and Wales the chance to vote for a Parturition candidate,» he said.
«Politicians who try to do these backroom deals, never total out of it well.»