Hello Siggi_Hartmeyer, I really like The hybrid Utricularia 'Nüdlinger Flair' (U. alpina x humboldtii) that you suggested above. Do you mind telling me approx how long the flower stems grow? I am looking for a U. alpina with flower stems on the shorter side as I would like to try and grow it in a terrarium 45cm x 45cm x 45cm. Any advice would be most appreciated. Thank you.