Although it wasn’t identified with a plant marker at Green Spring Gardens, I’m pretty sure this is a Blue False Indigo (Baptisia australis). This herbaceous perennial in the pea family grows 3-4 feet tall and features purple, lupine-like flowers blooming in spring. Its common name refers to the use of this plant by early Americans as a (lesser) substitute for true Indigo in making blue dyes.
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GIVE ‘EM SOMETHING TO TALK ABOUT