When to cut back water lillys

[SoCal Pond]

Now that spring is here and it is slowly warming up in the 9A / 9B Zone (near Las Vegas) do I need to do anything to my dormant, underwater potted lilies or do they just re-bloom on their own?

I'm just beginning my pond but in the same zone 9B So Cal. In 3 weeks I have one large green leaf lilly grow from 5 leaves to 10 leaves, another small purple leaf grow from 3 to 6 leaves with 2 still underwater. No blooming flowers yet. Sorry I don't know names. They have tags but are under water.

I also have a lotus that had three leaves and a nice flower that all fell apart last week but is now growing a new leaf at the bottom.

They are all in two feet of water and I have not touched them. They do seem to regenerate on their own. Hope that helps.