I've looked in the archives for this problem. I've had these hardy water lilies for years now. Even took them with me when I moved and kept in "storage" for a year while I dug my new pond. Anyway I have about 4 rhizomes in a 3 foot by 1 foot shallow square container about 20" deep. In early spring I had a ton of blooms, most I've had ever. Then as time went on they bloomed less and less to where I haven't seen one in about 3 weeks. Lily pad growth is booming though. I put fertilizer tabs(first time I ever done this) about 3 weeks ago. They get full sun from 10am to sunset. Is this too much? When researching this problem that seemed to be the problem...not enough sun. Trust me this pond gets blasted with unfiltered full sun for almost 10 hours a day. Had these plants for 8 years and I never had this happen. What gives????