The published gardening lore says "part-sun" -- where I have seen this growing in nature, it has been in shade. Bog gardens. Wet meadows. Moist nativ , Tolerance, Not salt tolerant of inundation by salty or brackish water. Low/no tolerance of salty wind or direct salt spray , Habitat, Associated with forested seepage settings. , Did You Know?, Showy flowers Pollinated by long-tongued bees, notably, bumblebees.