Membership of the Greens recently passed the 80,000 mark, he said, marking a rise of a third “in the last couple of months”.
Last year the party won a record four seats in Parliament, although none are covering constituencies north of Birmingham.
Polanski added: “I am absolutely committed to making sure we have at least one MP in the North, if not several.
“At next May’s council elections I want to make sure in places like Bradford we’re really growing, as well as Leeds and Sheffield.
“The Green Party were already going places, but right now we really have the momentum right across Yorkshire.”
