Hi Arif,
It seems nobody really knows the origins of the field poppy, nor do I, but your assumptions about seeds and boots might be as close to truth as we can get.
I don't see them often here where I live, though some did appear when I built a little rock wall a few years ago. Maybe the birds planted them but they never returned. I wish I could get the Meconopsis - Himalayan - to grow here, but too hot, too dry, I think. It's such a beautiful blue.
Now that I've written about that poem, I can't get it out of my mind.
