Another invasive weed that is difficult to control is Lesser Celandine. It is native to Europe and West Asia and is in the buttercup family. Wish they had kept it to themselves. It does have a pretty little yellow flower, but it gets into everything.
Due to the fact that people used it to treat hemorrhoids, it used to be known as pilewort. In German, the word for it translates as Scurvyherb because the leaves are high in vitamin C and it was used to treat scurvy.
The good thing about it is that it comes out early and dies back early. You might have a chance of eradicating it when you first get it if you are diligent about weeding. But once it gets a foot hold, it is almost impossible to get rid of. When weeding, make sure to get as many of the underground tubers as possible. Also, get to it before it dries up and drops its seeds.
Lesser celandine likes wet areas but will do fine in drier areas. You can almost forget about getting it out of wet areas but there is a chance in drier areas. Test the pH of the lawn or the garden bed. If it is low, spread ash, and put a heavier load on the areas with lesser celandine.
There are also natural broadleaf herbicides that has iron as its main ingredient and works well on celandine. One is named IronX.
Also, because lesser celandine loves water, don’t overwater. Another thing you can do is to put down Preen early in the spring. That will help prevent the tubers from the prior year from sprouting and coming up again. It won’t be perfect but should improve things year to year, until eventually you should have it under control if not completely removed.