

Garlic mustard; you ain’t getting any garlic bulbs out of that!
Fills out the understory pretty effectively there.
Edit: I didn’t look at the flowers or leaves or really anything up close and lept to a conclusion. It’s wild garlic as OP pointed out below, just an amount I’m not accustomed to seeing.
Yeah you’re right, I didn’t zoom in. Flowers are entirely different for a start.