This plant showed up in our garden this spring. It just began blooming a couple days ago.
Here are buds, getting ready.
Is this some kind of phlox? The plant itself is about 2 1/2 feet tall and looks quite civilized.
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You guessed right! This is Phlox paniculata, or tall phlox.
These grow wild in my woods, but there are many cultivars developed for garden use. That is a very nice volunteer plant, and I know a good many people who would be envious of such a healthy volunteer specimen in their garden.