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Kalm's St. John's Wort

Kalm’s St. John’s wort (Hypericum kalmianum) is a tough small flowering shrub native to the Great Lakes area. Easy to grow and versatile.

Plant name: Kalm’s St. John’s wort

Botanical name:
Hypericum kalmianum

Easy to care for. Stays small. Bears clusters of bright yellow frilly flowers over a long period in late summer. Evergreen leaves for year-round interest.

Flower: Bright golden yellow, saucer shaped with many prominent stamens, which give each flower a soft and frilly look. Flowers are held in cymes (branched flower clusters).

Foliage: Bluish green, long and narrow.

Habit: Upright bushy evergreen shrub, reaching 3 feet tall and 3 feet wide.

Season: mid- to late summer

Origin: Great Lakes region of North America

Cultivation: Prefers moist sandy soil, but will do well in any average well-drained soil, full sun to partial shade. Tolerates drought. USDA Zones 4–9.

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Image courtesyMissouri Botanical Garden PlantFinder