Ignorant Canadian but I know that around here the Greens aren't necessarily seen as the left wing party, in part because their program isn't broad enough

What's being green got to do with being left wing?

This is really the problem with left/right, you can be green and Tory or Labour. Green has little to do with supporting workers rights or supporting the church and monarchy.

[Edit] To clarify, being against building and preferring green spaces is a green position and also a driver for NIMBYs.

Tories get played as fools by their own party constantly, the little old dears in church voting Tory aren't supporting them because they keep moving more fash.

As a thought experiment, would supporting a workers union be left wing, even if it was for coal miners?

Not really. While the green party is left of labour. Its green credentials are pretty poor. Nimbyism has made them choose some rather odd positions.

This is an issue as it is a one issue named party. So like labour making odd non worker beneficial policies harms labour among left wing. Those nimby votes harm green reputation among green.

And while the 2 Green and left are not really related. They have a freaking huge crossover on a venn diagram. So both are rejected by a large % of the left.