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The species in this genus arose as a result of an evolutionary arms race with different butterfly species who drove the milkweeds to develop increasingly toxic poisons in their milky sap to fend off the butterflys' ravenous caterpillars. So leave the chewing to the Monarchs! This species has upright branching stems with oblong leaves and topped with dense clusters of tiny pure white vanilla-scented flowers which attract butterflies. Tolerant of moist or wet or average garden soils. Deer resistant.
Edges of ponds and moist soils, wet meadows, shallow waters. Banks and flood plains of lakes, ponds, and marshes. Ditch edges, dikes, swamps, wet prairies, and poorly drained spots.