It's probably galvanised, which should make it last a bit longer. I've had a 'tin bath pond' in my back garden for 2 years, 3 this year, and the birds love it. It has some flag iris in a basket, an arum lily in a teracotta pot, & some flowering rush also in a basket. The birds bath in it, drink from it and fight over the handle as a perch!
I've had a look for a pic, but I can only find one from when I first set it up - the plants have grown, been re-potted & swapped around since then! Still it gives an idea

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__________________
Sarah


“Tell me one last thing,” said Harry. “Is this real? Or has this been happening inside my head?”
“Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?”