Lesser Celandine lawn invasion
This is a terribly invasive plant called lesser celandine (Ficaria verna). It is very difficult to control and may require a combination of techniques. This can take time. Do not expect management in one season.
See our website and resource links for information and management options.
This is a tough plant on some of our Maryland native plants so it is worth trying to manage it. Here's an article on it from the Maryland Invasive Species Council. http://mdinvasives.org/iotm/april-2012/