"Thes" wrote in a message:
The good news is poppies are a doddle to grow from seed, so go
back to the roadside in a few weeks when the flowering is all over and
the plants look pretty much dead, snip of a few seedheads and sow them
next spring right where you want to grow them.
I'm a big poppy fan - P. bracteatum is a wonder...

Thes.
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Last year and the year before I did just as you recommend, gathered field
poppy seedheads. Shook the seeds out around the wildflower part of my garden
and guess what? Not one germinated. The same with teasels and white
campion. I asked for advice from a gardening friend who said that he
thought that my soil is far too rich for wild flowers and that they will
only grow in impoverished soil. Why then do I have red campion and alkanet
growing very happily almost everywhere?

Roscoe