posted 13 years ago
It is Coltsfoot (Tussilago farfara). It is an alien invasive in north america. I'm sure there must be a thread somewhere here on the permies forum, check for it.
That being said, it is not the end of the world. It is a pioneer species, doing very well in gravelly and sandy soil and will take shade quite well. It is a medicinal plant, a dynamic accumulator, and produces a large quantity of biomass (chop and drop). It is one of the earliest spring bloomers thus producing nectar for the pollinators. Dead heading the flowers before they go to seed will slow down its spread, but as more transition plants get established it will abate on its own.
I've also found that grasshoppers will select it over almost any other plant, and that it does seem susceptible to powdery mildew.
We cannot change the waves of expansion and contraction, as their scale is beyond human control, but we can learn to surf. Nicole Foss @ The Automatic Earth