[quote="MerryMary"]Can you move it and put it in a container pond on the deck? The water will be much shallower and easier for the sun to warm up. [/quote]
I agree with MM.
Truthfully I am surprised your water has not warmed up enough. I am in zone 5b as well and my pond is quite a bit deeper. Our water temps were in the 80ish range during July - which is cooler than some years as we have had a very rainy summer as well.
Do you know how long the water temps have to sustain a warm temp in order to flower?
My water lillies from Mittsy are in large basin of fountain in water and it gets very warm but they are not growing. I found 1 had turned to mush today and threw it which made me sad.
When M. Mary comes over I'm sure she will have some words of wisdom for me that might save them. Sure would like to see them grow.
I have several tubbies and also small pond so I will do that. I'll put some small rocks on the top to keep dirt from floating out. Don't want to put them in fish ponds cause don't want dirt in there.
Thank you for info.
I'm going to go against the grain and tell you that I don't plant any of my water lilies. I just pin them down under rocks, in full sun, away from moving water. They bloom like crazy. Now I also plant tropical liles, for the most part. Tina and Panama Pacific has been my favorites, the new plants are formed from the middle of the leaf, so I don't divide the roots.