Locally I haven't noticed poplar used in old frames, hardly any hard woods, if at all.

I have used it, my mill building has two post of poplar. As I recall the wood worked fine, nice actually, not many knots to contend with. I have seen no problems after 10ish years with twist etc. I would for sure use it again if the opertunity arises.

I do not know the exact populas group in which it belongs. I do know we have at least three different types and maybe more if one looked closer. Some bud at different times of the spring season, another is found around abandond farm steads along with the apple trees, lilacs and old stone cellar holes.

I burn it for firewood after I have cleared the weed from my blueberry field edges. I am not selective when it comes to firewood.

Tim