Soldago bicolor; Asteraceae (aster family)
That’s right, another goldenrod. Except this Solidago has white flowers (it’s the only one that does), therefore silver-rod. I found it the morning after returning from Montreal, blossoms just opening on a few plants, but dozens more plants almost ready. With any luck they won’t be finished blooming when I get back from my Nova Scotia trip… If they aren’t I’ll get some better pics and write a proper FotD post.