just plant them either in quite deep pots and leave them outside. they are odd the first year they put down a root so you have nothing to show above ground then the following year they produce the shoot and then they are off!. I usually put 2 seeds in a tall 6" square pot and then leave them alone. when I have clear plants I separate them. if its P lutea, the yellow one they germinate readily.

Thank you. They sound odd. I've had a bought one for 4 years this year, it was in flower when I got it, since then ... nothing.
I believe that they are yellow. I'll get them planted and just check that they don't dry out.

Thanks again. Gail