PF - no one has answered yet. But, they will. There are not too many philo-fans on the aroid forum that I recall. Most are on the other board, but I don't recall the name of it off hand. I've never seen one flower, period. So, you're lucky, to me.

The spathyphyllums flower year-round - I know they're not monsteras, but I am wondering if there is no particular pattern to their flowering season. On the other hand, maybe there is. Have you looked on aroid.org website? There is a lot of info there, too. You'll probably get an answer eventually, but it may take a couple of days. Be patient. And good luck.

Susan