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Swamp aster is a robust perennial reaching 3 to 6 feet tall and spreading 2 feet wide. It thrives in full sun to part shade and prefers consistently moist to saturated soils, where it creates a dramatic vertical presence. In the landscape, it is a critical late-season ecological hub; its large, pale blue to violet flowers provide a final high energy nectar source for monarchs and bumblebees before winter. It also serves as a host plant for the pearl crescent and silvery checkerspot butterflies.
