Agrostemma githago

Bit obsessed with seed pods at the moment

Please help me identify this plant

Looks like corncockle, an annual wildflower ☺

If you have any other flowers do they have only 4 petals or possibly 5? The corn-cockle or Agrostemma githago usually has 5 petals but it looks very close ?

I think it must be a deformed corncockle flower with a petal missing and only one petal has the heart shape to it.

Thanks all I don’t think it was fully opened x

Btw, I read all parts of the plant are toxic so wear gloves if you need to handle it. ☺