P. somniferum in the young cabbage stage, pretty obviously.
@killagator The ones I am growing sure look exactly like that, only smaller.
Base on how some of the leaves are yellowing, they either aren't getting enough magnesium, or they're getting rootbound (the latter happens easily which is why you need to cull the small ones, keep them spread out over a large area, etc).
I mean, or so I've heard. No idea myself.
Worst case, you can make some...delicious (🤮) poppy straw tea from the lot.
@MallyDaKatt I have no clue, but there are apps that can identify plants.