Full sun of 6 hours direct sun minimum for blooming but wow it blooms a lot unless it needs dividing. Fertilize in pots monthly or twice a month and you will have lots of flowers. You probably never need to fertilize in earth bottom ponds.
This plant is sterile and wont seed or take over so great for farm ponds, lakes, retention ponds and similar large situations!
Best planted in loam soil at 1 foot in-depth but up to two feet in spring up to 8 weeks before frost. 4 to 6 fertilizer tablets if keeping in a 15 inch or wider pot. We have 15 inch wide fabric hardy lily pots and fertilizer fish safe aquatic tablets!