PlantsHypericum→St. John's Wort (Hypericum perforatum)

Common names:
Give a thumbs up St. John's Wort
Give a thumbs up Common St. John's Wort
Give a thumbs up Klamath Weed
Give a thumbs up Perforate St. John's Wort
Give a thumbs up Common St. Johnswort

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
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


Wildflowers in EuropeWildflowers in Europe
By JonnaSudenius on August 20, 2013

These are my personal views on growing plants and a little overview of some European wildflowers

(Full article22 comments)
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This plant is tagged in:
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Posted by growitall (Calgary, Alberta, Canada) on Mar 1, 2014 12:23 PM

Has naturalized to become an invasive weed in many areas, spreading by rhizomes and seed.

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Posted by ZGadev (Varna,Bulgaria) on Jul 14, 2018 8:10 AM

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.

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Posted by Johannian (The Black Hills, SD - Zone 5a) on Jan 9, 2022 6:06 PM

Range: in the West especially common from California to western Washington.

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Discussion Threads about this plant
Thread Title Last Reply Replies
Unidentified wild plants N.E Florida by Fiddlehead Sep 30, 2019 12:49 PM 2
An Alternative to Mowing by NickyNick Jul 19, 2019 12:53 PM 22
Plant ID by Nicxr Nov 27, 2018 7:56 PM 3
Plant Trivia by JHeirloomSeeds Apr 12, 2019 8:08 AM 401
Untitled by Almostdone Apr 8, 2018 5:48 PM 0
yellow flower ID by ElJardineroGringo Sep 14, 2016 9:06 PM 3
Yellow Wildflower? by Natalie Jul 8, 2013 1:42 PM 3

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