How to grow Pretty desert plants in tainted soil?

I live in the desert of Tucson, AZ and have had trouble planting pretty flowers in my soil. My neighbors said the mobile home park next to ours sprayed chemicals in their soil to clear the land and it has leached over into our soil over the years. I was able to plant some agave but even it has started to die after being in the soil and blooming for 2 years. Some of my friends on the opposite side of my park have beautiful roses and butterfly bushes and bird of paradise plants. What do you think I can grow in soil that is tainted>

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