Hypericum kalmianum

Kalm's St. John's Wort (Hypericum kalmianum) is a perennial shrub that typically grows up to about 3 feet tall. It features bright yellow flowers in small clusters at the ends of its four-sided branches and has papery bark that peels as it matures. This species thrives in full sun and prefers dry, sandy loam soils, making it well-suited for rocky or sandy habitats. Kalm's St. John's Wort is drought-tolerant and does best with minimal watering once established, making it a good choice for low-maintenance landscapes.

Native range

Great Lakes regionNative here

Bloom time

June – August

Garden location

Southwest Sidewalk Bed