>I have obtained seeds of Iris iberica subsp. iberica. I have read that they have a low germination rate and that specialists resort to forced germination using the arillusom incision method. I am certainly not able to practise this method. I would therefore like to know if there is a simpler method to promote germination. Is it true that the seeds must be stratified in winter? So when should they be sown? Seeds of oncocyclus iris species which are native to regions with cold winters do require a cold treatment in order to germinate. Reports suggest that the seeds require some months at 4C, then some months at 21C. This alternation of temperatures is repeated until the seeds germinate. Seeds germinate erratically, taking any time between one year and twenty years. The forced germination technique is actually quite easy. If I can do it, anyone can. http://files.srgc.net/general/… Bob Nold Denver, Colorado _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>