One of the hardy pond lilies I picked up at Linder's this year (non-native). The blossoms may look nice, but they're finicky little rascals. They only bloom when they have just the right amount of sun and are sitting properly on the water. Blooms only take about ten minutes to open or shut.

Though they say that these lilies are hardy, last year's specimen didn't overwinter, so I'll be moving this one to our inside pond in late October.