Hello Shmuel, The water flotation method of germinating seed is very reliable. I even managed to germinate seed of overstored short lived Amaryllidaceae seeds this way. But I would not call it the float and sink method. Seeds sinking do not germinate. It is more float and root. With valuable seed I use tweezers to fish them out of the water and plant them individually when the root appears and leave the non sprouted ones floating. But I always remove sinking seeds as they might spoil the rest. Could you feel an embryo when you gently take a single seed between index and thumb? If not the seed may have been empty. I also have a nice Zephyranthes which refuses to set seed after self pollination so may be the seed set of your plants was not viable as already commented. Bye for today Uli _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…