Hello all. Re Jim Waddick's idea that more people should be growing the arilbred irises. I agree, but I'd be more cautionary than he, having grown them off and on for about 50 years. Much depends on where one lives, and the adjustments one is willing to make. In the U.S. Most can be grown relatively easily in a raised bed or a hillside in gritty to gravelly soil, which has a fairly large particle size. I would not advise anyone outside of southern Calfornia to grow the species, with a few oncocyclus species exceptions, and the regelias which are more tolerant of water and tougher with respect to cold and below freezing temperatures. To grow the oncocyclus species for more than a year, (bringing them through a couple of winters) requires that they be covered and shielded from rain during their necessary summer dormancy. Further, although virus can be a problem particularly with the species, and some of the older arilbreds, the greater problem in the U.S. east of Nebraka is iris borer which can have killed plant while you think it's still alive. Imidacloprid is the best defense against this with two early sprayings or granules in the ground in early April or March. An aspirin drench of 2 325 mg. tabs /gal.is a workable defense against virus infections, keeping them under control quite effectively so one wiill not even see any evidence of virus. I am impressed-- Luc, with the idea that you may have I. bismarckiana growing from seed. What was thte provenance of the seed? It was declared extinct at the original site at Crak des Chevaliers in Syria a few years ago, but I have some reason to believe that that report was premature. I bloomed a few plants from there back in about 1960 and have never forgotten the experience but could not keep them alive. The humidity alone in Illinois is high enough to guarantee their dying. I would regard seed from most other souces as not being I. bismarckiana, even if appearing to satisfy the botanical key. It is easily confused with I. hermona. Incidentally this is one species I would say not even be tried, allng with auraniti, sofarana and gatesii unless one is prepared to grow the rhizomes in pure coarse sand, gravel, or decomposed granite (with the dust sifted or washed out), and covered and baked in the summer in neutral to alkaline pH. Fortunately they are nearly unobtainable. Representative forms of arilbreds can be seen by going to the Aril Society International site ,and then clicking on the checklist marker in the left margin , then going to the illustrated in color checklist which will and colorful checklist.