Please tell me what the plant is . I live in Vancouver,BC and I came across this flowering plant close to where I live.

https://calscape.org/Romneya-coulteri-(Coulter%27s-Matilija-Poppy)

Romneya coulteri

But use the botanical name if you are researching it. There's at least one other plant called fried egg plant.

Unlikely to be excessively aggressive here in the PNW. Wants full sun and very good drainage and minimal watering after establishment. I grew it in my beachside garden and it was easily manageable. Just dig up any shoots that stray too far.

It is a big cheerful plant (to 6') with those large tissue paper-like flowers. Actually, here propagation is not all that easy as it resents any root disturbance and is difficult from seeds. They need scarification by fire to germinate. But a small, well-rooted start should take well.

I've failed to propagate it several times, not that I tried very hard. But it wasn't as easy as pulling up a bit and sticking it in the ground. I probably didn't get enough roots.