Answer: Filipendula rubra (Martha Washington Plume) grows to 6' in height, loves moist soil, and produces clear pink flowering plumes during mid-summer. Cornus alba 'Elegantissima', a form of red twig dogwood, has green and white variegated foliage and pink flowers. This dogwood thrives in damp to wet conditions. Prune it back hard each year and it will grow lush and thick. Either of these plants will perform well under the conditions you describe.
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