Alice - That bloom is fabulous! So many petals! Eye candy for sure!
I do fertilize my lotus and waterlilies, but the weather here has been so unpredictable, that maybe that has something to do with it. I often don't get blooms every year. More like every other year. And the waterlilies produce blooms later like in late July or August. They are just late bloomers here if they bloom at all. I get plenty of leaves though.