Posted: 22/07/2016 at 08:53
It's an opium poppy. Papaver somniferum.
Let the seed pod go Brown and the holes at the top open before you collect seed. Store in a paper bag. Scatter next March where you want them to grow. There may be variation, but they usually come true.
They are annuals.
Last edited: 22 July 2016 08:56:10