Hello, thank you for your inquiry -

Per the manufacturer, this product ships in raw steel state and gradually develops rich rust patina over time. The rust will transfer to the concrete, however, a power wash should remove the rust stain from the concrete.

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Thank you!

The Houzz Team

Thank you. Understood that it starts raw and patina's over time. Was more inquiring about anything on the bottom that would help prevent the rust transferring to the concrete? It doesn't sound like it. thank you!

It will rust onto the concrete. You can try to spray a clear sealer on top.

I was thinking same thing. I've seen planters put on rock but we have concrete area that don't want rust leaking. Sounds like treating clear sealer is the way to go...