Image for Kalm St. Johns Wort

Kalm St. Johns Wort

Scientific name

Hypericum kalmianum


Kalm St. Johns Wort is a short, evergreen shrub species that typically grows less than 1 m in height. Older bark is reddish brown and appears shedding. The leaves are bluish green colored, narrow and linear shaped, appear in oppositely arranged pairs, and have entire margins. The flowers are showy, golden yellow colored, have five petals, numerous stamens, appear on upper branching stems, and bloom between July and August. These flowers produce small brown oval seed capsules. The flowers are beneficial for pollinator species, like bees and butterflies. These shrubs are visually attractive and used for making low hedges.

Planting conditions

Kalm St. Johns Wort grows best in moist to wet conditions with full or partial sun exposure. It prefers well-drained, organically rich sandy loam soil types. It is tolerant of periodic flooding and shallow rocky soil. This shrub can be naturally found in sunny wet forests, wet meadows, or along moist sandy shorelines.


  • Plant height:
    • Max 1.5m
    • Max 2m
    • Max 3m
    • Any
  • Moisture level:
    • Normal
    • Moist
    • Wet
    • Drought Tolerant
    • Flood Tolerant
  • Light conditions:
    • Full sun
    • Partial sun
  • Soil type:
    • Sandy
    • Loamy
    • Rocky
  • pH:
    • Normal
  • Depth:
    • Potted
    • Bareroot
  • Eco Zone:
    • 5a
    • 5b
    • 6a
    • 6b
  • Plant type:
    • Shrub
  • Height:
    • 1 m
  • Spread:
    • 1 m