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Concerning to achieve flowers please have a look at my post in this Forum dated december 5th 2011!Gerd
I suppose these viridiflorus are poeticus selections or crossing with poeticus. Mine flowered all in spring and had much broader leaves than viridiflora.
I also have copies of at Nijssen Tuin. This is Narcissus viridiflora II and V.Here are pictures of N. viridiflora II. I forgot to photograph the viridiflora V. (Attachment Link) (Attachment Link)