Do experiment. Be sure you understand that I was referring to hardies only when I was saying that my lilies bloom just as good or better in my coldest pond, low 50s, as in my hottest pond, upper 80s.
Tropicals like it hot.
I have odorata and odorata x mexicana plants in my cold pond. Some in 7 ft. of cold dark water.
Not enough sun and or over crowding of to many connected crowns and "tuberoids" is the main cause of low flowering of lilies. Next on the list would be excessively low fertility. Moderately low fertility is fine for most lilies but some respond very well to increased fertility without making lots of leaves. Fairy Skirt is one that likes it's fertilizer and without it won't have as strong of an outward curl to the sepals and petals.
Many plant's will not show their true flower form if under fertilized or crowded.
This big yellow has wide wavy petals with more rounded tips than the two flowers to the left from a younger more crowded less fertilized crown.