Photo by Melody

PlantFiles: Perforate St. John's Wort, Common St. John's Wort
Hypericum perforatum

Family: Clusiaceae
Genus: Hypericum (hy-PER-ee-kum) (Info)
Species: perforatum (per-for-AY-tum) (Info)

3 vendors have this plant for sale.

35 members have or want this plant for trade.


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

18-24 in. (45-60 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Sun to Partial Shade


Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer


Other details:
May be a noxious weed or invasive
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
From softwood cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

Click thumbnail
to view:

By cristina
Thumbnail #1 of Hypericum perforatum by cristina

By poppysue
Thumbnail #2 of Hypericum perforatum by poppysue

By poppysue
Thumbnail #3 of Hypericum perforatum by poppysue

By kennedyh
Thumbnail #4 of Hypericum perforatum by kennedyh

By kennedyh
Thumbnail #5 of Hypericum perforatum by kennedyh

Thumbnail #6 of Hypericum perforatum by BUFFY690

By kennedyh
Thumbnail #7 of Hypericum perforatum by kennedyh

There are a total of 17 photos.
Click here to view them all!


1 positive
3 neutrals
1 negative

Gardeners' Notes:

Negative pookha On Aug 24, 2013, pookha from edmonton
Canada wrote:

Classified as a prohibited noxious weed by Govt. Alberta
Please check your province/state

Positive Rotegard On Nov 29, 2006, Rotegard from Minneapolis, MN wrote:

Our St. John's Wort is the hardiest ground cover herb in the Lasalle community garden (Minneapolis 55403) its yellow flowers bloom most of the growing season and are good for bees. Our patch is in full//partial sun and has to be trimmed back to keep it from overwhelming neighboring Elecampene, Rue, and Melissa. It also grows wild in the prairie habitat in the Eloise Butler Wildflower garden on the west side of the city. The flowers make a useful tincture in little (50ml) vodka bottles.

Neutral PurplePansies On Jul 27, 2003, PurplePansies from Deal, NJ (Zone 7a) wrote:

This plant grows wild where I am, (the Mid-Atlantic). It's not a really showy plant, not suited for a perennial or flower garden. Although it may be at home in a wild, wild-flower or medicinal/herb garden. It is pretty invasive, so don't plant near shyer plants. Can grow in dryer soil but prefers moister, grows very well in even wet soil, (it often grows here on riversides and beside lakes). Grows in sun to partial sun, partial shade. Said to be useful in treating depression, but I have no idea how to prepare the plant for this use.

Neutral smiln32 On Jul 30, 2002, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Hypericin compounds found in flower petals, leave and stem tissue are said to have antidepressant effect in humans, but can cause light sensitivity.

Neutral Terry On Aug 13, 2001, Terry from Murfreesboro, TN (Zone 7a) wrote:

Perforated St. John's Wort is found in drier conditions than other species.

A popular herb in medieval times, St. John's Wort has recently been rediscovered as an herbal anti-depressant.


This plant has been said to grow in the following regions:

Birmingham, Alabama
Ceres, California
Woodstock, Georgia
Centerville, Iowa
Erie, Michigan
Saint Helen, Michigan
Cole Camp, Missouri
Saint Louis, Missouri
Euclid, Ohio
Salem, Oregon
Feasterville Trevose, Pennsylvania
Millersburg, Pennsylvania
Norristown, Pennsylvania
Wakefield, Rhode Island
Columbia, South Carolina
Hendersonville, Tennessee
Wytheville, Virginia

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America