Which perennials grow well in wet soils?

FAQ
Question: 

Which perennials grow well in wet soils?

Answer: 

When selecting perennials, it’s important to choose plants that are suitable for the planting site.  Perennials that grow well in moist to wet soils include sweet flag (Acorus calamus), Jack-in-the-pulpit (Arisaema triphyllum), goat’s beard (Aruncus dioicus), swamp milkweed (Asclepias incarnata), turtlehead (Chelone species), black snakeroot (Actaea racemosa), Joe-pye weed (Eupatorium purpureum), queen-of-the-prairie (Filipendula rubra), rose mallow (Hibiscus moscheutos), Japanese iris (Iris ensata), yellow flag (Iris pseudacorus), cardinal flower (Lobelia cardinalis), obedient plant (Physostegia virginiana), and spiderwort (Tradescantia species).  

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