I believe they can remain dormant for up to fifty years so you might
have a
long wait!

Ron

They *CAN* they rarely ever do.. At least not all of them. They do
also, IIRC need a little light to germinate, hence the dormancy thing.
EG they lie buried for up to 50 years but dormancy is broken when they
are brought to the surface.
//
Jim

Agreed; sowed lots of them last year in seed trays. They all came up. Nice
show this year, though the leaves look a bit past it at this time of year.
Will
mix them with a mixture of red poppies next year for an even better show.

Andy