I apologize for this delayed reply to your gardening question and hope it is still helpful to you. Leaching from concrete tends to make the soil pH go up but is not lethal otherwise. I would try one or more of the following plants: Salvia 'Mystic Spires', Chiapas Sage (also a salvia), or zinnias that are a dwarf type.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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