Mauro you are getting me conditioned to think of dowiana when I see your name.
I was challenged by this species, Sun rm.N.E. I had tried it a number of times, always unsuccessfully. I decided then to buy a compot and start adapting the small seedlings to my condition. I have now about twenty plants reaching maturity (lost two or three only!). The ones I posted here are the two first to bloom!
Awesome! I have grown one from a seedling for years. I have never seen a plant grow so slowly. If I am ever to see flowers, I think I must buy another plant.