Thank you for the question. The leaves do look like a 2nd year garlic mustard but garlic mustard blooms in the spring. This plant looks similar to another one you submitted about 10 months ago and we identified it as white snakeroot:
https://www.minnesotawildflowers.info/flower/white-snakeroot This plant blooms July-October.
It seems you are curious about plant identification. Here are some books and websites that might help you identify them on your own if interested:
- Wildflowers of Wisconsin and the Great Lakes Region by Merel R. Black and Emmet J. Judziewicz
- Weeds of the Northeast by Richard H. Uva, Joseph C. Neal and Joseph M. DiTomaso
- Lake Phalen Shoreland Restoration Walking tour and Plant Guide by Haley Elvecrog and Bill Bartodziej