The Kalm St. Johnswort is native to central Wisconsin to all around Lakes Michigan, Huron, and Erie in bogs, dunes, and on cliffs in dry to draining wet soils in muds to rocky--sandy soils that are moderately acid to quite alkaline. The bluish-green leaves are whitish bloomy beneath and about 1 to 2 inches long. Flowers about 1/2 to 1 inch in diameter; slightly fragrant. The dry brown capsules are 4 to 6 celled. The root system is shallow and fibrous and it is easy to transplant. It is sold by native plant nurseries and some larger, diverse conventional nurseries. It is not a common plant in landscapes, just very occasionally used here and there, mostly by landscape architects and garden enthusiasts.

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