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Kalm's St. John Wort

Hypericum Kalmianum

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Overview

Hypericum kalmianum, or Kalm's St. John's Wort, is a compact, dense shrub reaching 2-3 ft tall and wide. This hardy perennial features showy, bright yellow flowers in summer, each with a burst of prominent stamens. Its bluish-green foliage remains attractive throughout the growing season. Ideal for borders and mass plantings, it thrives in full sun to partial shade and well-drained soil. Zone 4-8 hardiness ensures wide-ranging adaptability.

Sun Full, Half, ShadeWater Extra in Summer, MediumZones 4–7Type Broadleaf Evergreen, ShrubClimate Temperate
Kalm's St. John Wort (Hypericum Kalmianum) — John's Wort, is a compact, dense shrub reaching 2-3 ft tall and wide

Culture

Sun
Full, Half, Shade
Water
Extra in Summer, Medium
USDA zones
4–7

Shape & size

Mature height
2–3 Ft.
Mature width
2–3 Ft.

Classification

Type
Broadleaf Evergreen, Shrub
Family
Hypericaceae
Climate
Temperate

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Photos (62)

Kalm's St. John Wort (Hypericum Kalmianum) — This hardy perennial features showy, bright yellow flowers in summer, each with a burst of prominent, image 26
Kalm's St. John Wort (Hypericum Kalmianum) — Hypericum kalmianum prefers full sun to part shade and well-drained soil; showcases a burst of showy stamens
Kalm's St. John Wort (Hypericum Kalmianum) — or as part of a mixed perennial border.<br><br>Featuring a dense
Kalm's St. John Wort (Hypericum Kalmianum) — It is hardy in USDA Zones 4 through 8, demonstrating excellent cold tolerance; making it a low-maintenance choice
Kalm's St. John Wort (Hypericum Kalmianum) — John's Wort is adorned with a profusion of bright yellow flowers from mid to late summer
Kalm's St. John Wort (Hypericum Kalmianum) — making it an excellent choice for low hedges
Kalm's St. John Wort (Hypericum Kalmianum) — Hypericum kalmianum, commonly known as Kalm's St
Kalm's St. John Wort (Hypericum Kalmianum) — yellow flowers in the garden
Kalm's St. John Wort (Hypericum Kalmianum) — John's Wort, is a compact, dense shrub reaching 2-3 ft tall and wide; ideal for borders and mass plantings, it
Kalm's St. John Wort (Hypericum Kalmianum) — is a valuable North American native flowering shrub that adds exceptional beauty to landscape designs
Kalm's St. John Wort (Hypericum Kalmianum) — which draw in pollinators such as bees and butterflies to the garden; broadleaf evergreen / shrub with yellow
Kalm's St. John Wort (Hypericum Kalmianum) — showcases a burst of showy stamens
Kalm's St. John Wort (Hypericum Kalmianum) — The foliage of this deciduous shrub consists of narrow
Kalm's St. John Wort (Hypericum Kalmianum) — which draw in pollinators such as bees and butterflies to the garden
Kalm's St. John Wort (Hypericum Kalmianum) — Ideal for borders and mass plantings, it thrives in full sun to partial shade and well-drained soil; john's Wort
Kalm's St. John Wort (Hypericum Kalmianum) — This species typically reaches 2 to 3 feet in height with a similar spread; zone 4-8 hardiness ensures
Kalm's St. John Wort (Hypericum Kalmianum) — Hypericum kalmianum, commonly known as Kalm's St; the foliage of this deciduous shrub consists of narrow
Kalm's St. John Wort (Hypericum Kalmianum) — making it a low-maintenance choice for the landscape.<br><br>When advising clients
Hypericum Kalmianum
Hypericum Kalmianum
Hypericum Kalmianum
Hypericum Kalmianum
Hypericum Kalmianum
Hypericum Kalmianum
Photographs by 7 contributors

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