Flowering aquatic plants for zone 4?

Are there any good flowering aquatic plants that would be good for zone 4? ( Denver area )
I have this heavy steel tub out in the yard. We don't even know what the heck it is. It's open on the top but not the bottom. I tried putting some strawbrries in there but they sat in water, the thing doesn't drain enough. ( it has one hole in the bottom, about 1/2" square but it's not enough )
So are there any kinds of plants that I can put in it, that will do well sitting in water and maybe give me some nice flowers?
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- Mama Bear

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Mama Bear wrote:

Some of the water loving irises would look nice in there.
Steve
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