General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Minimum cold hardiness: Zone 2 -45.6 °C (-50 °F) to -42.8 °C (-45°F)
Maximum recommended zone: Zone 8b
Plant Height: 45-60 cm
Plant Spread: 40 cm
Flowers: Showy
Flower Color: Yellow
Flower Time: Late spring or early summer
Summer
Late summer or early fall
Uses: Erosion control
Medicinal Herb
Will Naturalize
Suitable as Annual
Propagation: Seeds: Provide light
Self fertile
Suitable for wintersowing
Sow in situ
Start indoors
Can handle transplanting
Propagation: Other methods: Cuttings: Root
Pollinators: Self
Flies
Bees

Image
Common names
  • St. John's Wort
  • Common St. John's Wort
  • Klamath Weed
  • Perforate St. John's Wort
  • Common St. Johnswort

Photo Gallery
Location: Hohe Tauern - Austria
Location: Carson City, NV
Date: 2020-06-18
Location: Hohe Tauern - Austria
Location: Caribou Maine
Date: July 2018
Location: KYLE
Date: 2019-03-01
Location: San Antonio Botanical Garden, San Antonio, Texas
Date: 2022-04-04
Location: Caribou Maine
Date: July 2018
Location: Caribou Maine
Date: July 2018

photo credit: R. A. Nonenmacher
Photo by robertduval14
Location: San Antonio Botanical Garden, San Antonio, Texas
Date: 2022-04-04
Location: Caribou Maine
Date: July 2018
Location: Canada
Location: Found on a waste field, Gent, Belgium
Date: 2012-06-28
Location: Brownstown PA 17508
Date: 2021-06-26
Non-native but Bumblebees seem to like it
Location: CZ Sirem My garden
Date: 2015-07-05
Location: Varna
Date: 14.07.2018
Botanical illustration of Hypericum perforatum
Location: On my property in Lenore, ID
Date: 7/8/2013
Location: On my property in Lenore, ID
Date: 7/8/2013
Location: Found on a waste field, Gent, Belgium
Date: 2012-06-28
Location: CZ Sirem My garden
Date: 4000-06-25
Location: CZ Sirem My garden
Date: 2015-06-20
Location: My garden in Belgium
Date: 2009-08-11
Location: Kitchen Garden
Date: 2014-09-09
End of summer
Location: Saint Helena Isle, St. Ignace, MI
Date: 2016-09-04
Growing wild on protected Island on Lake Michigan--peeking out of
Location: Saint Helena Isle, St. Ignace, MI
Date: 2016-09-04
Growing wild on protected Island on Lake Michigan
This plant is tagged in:
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Comments:
  • Posted by ZGadev (Varna,Bulgaria) on Jul 14, 2018 8:10 AM concerning plant:
    In Bulgarian жълт кантарион.
    Perennial herbaceous plant with horizontally creeping rhizome. Stems upright or upward, 20 50 (100) cm high, round or twin. at the top highly branched. The leaves are adjacent, linear to oval lanceolate or ovate. Petals 5, along the edge with black dotted glands, in the upper half with black and reddish (dotted and linear) glands. Fruit egg-shaped 3-socket multi-seed pod. Blooms May - August.
    Main action - Regenerative, anti-inflammatory, used against ulcerative disease, depression, eczema (topical application), periodic emotional disorder, melancholic conditions, anxiety, symptoms of smoking cessation, mouth rash, herpes.
  • Posted by growitall (Calgary, Alberta, Canada) on Mar 1, 2014 12:23 PM concerning plant:
    Has naturalized to become an invasive weed in many areas, spreading by rhizomes and seed.
  • Posted by Johannian (The Black Hills, SD - Zone 5a) on Jan 9, 2022 6:06 PM concerning plant:
    Range: in the West especially common from California to western Washington.
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Black Creek Greenhouse - qty 3
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