Plant name: Kalm’s St. John’s wort
Botanical name: Hypericum kalmianum
Virtues: 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.
Image courtesy Missouri Botanical Garden PlantFinder