Ed West gets it about right:
It wants pre-industrial economic policies mixed with 21st century radical sexual politics mixed with a strong hostility to pleasure, especially if someone’s making money out of it; it supports hard secularism and population control policies combined with open borders and pacifism (let’s see how that works out!); immense levels of state control over our private lives alongside moral relativism towards things like terrorism and crime. Its support base is mostly the educated, squeezed middle yet its economic policies would certainly ruin them.
As Ed points out this won't make a jot of difference to the Party's appeal - trendy hipsters in Saltaire will carry on voting for them - but it is a reminder that the Greens are utterly bonkers.