I'm assuming the former?
It's a poppy
You're joking? If it is well that's a coincidence! Annual one I assume?
leaves suggest Welsh poppy, perennial but see when it flowers
If it opens as yellow, or possibly orange, it is Meconopsis cambrica, the Welsh poppy. It is perennial, but short lived...two or three years. It does seed all over the place though.
Beware of letting such a pretty thing self seed.
They throw a tap root down when they germinate which is tricky to remove when it's in the middle of clump of herbaceous plants.
I have lots in my hostas. I let the poppy grow to a decent size then pull the whole thing at the base which tends to come out fairly clean . The shade of the hosta foliage usually deters regrowth ( but not always)
Very pretty indeed, but don't be seduced by its charms too much.
Easy to pull out though. I have seen a gorgeous double at Crug farm, however it apparently does not seed true . Seed of double flowered form I bought has not germinated.