as promised [here], the mystery weed has bloomed and has a name
woolly mullein Verbascum thapsus of the Figwort Family
sulphur cinquefoil Potentilla recta of the Rose Family
daylily Hemerocallis fulva
The rubble pile has given up more treasures. This time part of a bottle with a traceable history.
WF&S MIL (Milwaukee, WI) ~ William Franzen & Sons 
In operation from 1894 to 1929, they originally marked their bottles with this imprint, although from 1894 to 1896 they were the Northern Glass Company, and from 1896 to 1900 they operated as Northern Glass Works. 
I love urban archeology!