A slender perennial with a typical aspect of St. John’s- wort plants; elliptical leaves and bluish-green stems bearing clusters of small, pink flowers. Usually the flowers present like closed buds (unless very lucky to catch them open).
The reddish colour of the buds/capsules and leaves in the fall makes it very attractive. I can see it looking good at the edge of the pond, streams…; naturalizations projects.
To give an idea of plant associations, besides grasses, Lobelia cardinalis was growing nearby.
Germination: no info, so to be sure you cover all possibilities sow in late fall; small seeds – sow superficial.