Lesser celandine is incredibly difficult to manage and usually requires chemical control, over several years. It is unlikely that other plants will establish unless the lesser celandine is brought under control first. Here is our web page with more information and resource links. See Management options for wetland areas.  https://extension.umd.edu/resource/lesser-celandine

Also, see the publication from Weeds Gone Wild under resources. This publication lists several alternative plants. (This site seems to be down when I checked today.  Perhaps you can check later). Also consider Packera aurea, Golden groundsel.

Marian

We wanted to add some additional information. Since you live in Montgomery County here is some information about the Montgomery County Pesticide Law. There are some jurisdictions that are exempt. https://www.montgomerycountymd.gov/lawns/law/

For larger infestations, chemical control (glyphosate) can be used to manage lesser celandine in garden beds.  However, it turns out the lesser celandine is one of four difficult weeds that is exempt from the Montgomery County Lawn Pesticide Law. You can use synthetic herbicides to control these weeds in a lawn, if the infestation is larger than what you can control by manual digging. https://www.montgomerycountymd.gov/lawns/law/exemptions.html

Marian