For most of our members poplar will be the least expensive hardwood available. The greenish tint is highly visible in almost all the poplar I see locally. I am sure this is due to the quality we get here. If you have access to clear poplar that doesn't have any of the green then by all means give it a shot. The generally accepted rule is to use poplar in applications where it will not show, will be painted, or covered by a heavily pigmented stain.