The yellow flowering bush is a coreopsis. Perhaps a moonbeam coreopsis? This is a planting from mom's garden. It's a drought-tolerant perennial that the butterflies and bees love. And I just read that goldfinches like the seeds in fall.
And the tall plants with big leaves and clustered purple flowers are milkweeds. Monarch butterflies need milkweeds to lay their eggs and, as caterpillars, they eat the leaves. I am happy to see this plant and will make sure their seeds "drift" to other garden areas!