Help with germination please


I have seeds of
 
Asclepias asperula ( Asclepiadaceae )
 
Pontederia cordata ( Pomtederiaceae )
 
Sphenociadium capitellatum ( Apiaceae/Umbelliferae )
 
Triosteum perfoliatum ( Caprifoliaceae )
 
and I would very much appreciate if anyone could share their experience with any of these or related species. According to N.C. Deno Pontederia didn't germinate in any treatments in his experiments, and Triosteum did not germinate in 40 - 70 or 70 - 40 , and puncturing had no effect. Maybe outdoor-sowing would be best. Sincerely,
                                                                                                                                                                 Paul M. Olsson
                                                                                                                                                            p*@mbox305.swipnet.se


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