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St John’s Wort

Hypericum perforatum

Also known as

Perforate St John's Wort, Cammock, Common St John's Wort, Devil Chaser, Devil's Flight, Devil's Scourge, God's Wonder Plant, Herb John, Human Blood, Klamath Weed, Penny John, Rosin Rose, St Columba's Flower, St. John's Wort, Tiptonweed, Goatweed, Racecourseweed

Full Sun
Moderate care
Moderate watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size








3 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has a mild fragrance

St John’s Wort Overview

A flowering plant and a medicinal herb. A traditional flowering plant that is harvested on St John's Day, 24th June. The genus name 'Hypericum' is derived from the Greek words 'hyper' and 'eikon', in reference to the tradition of hanging plants over religious icons in the home during St John's Day, to ward off evil.

Common problems with St John’s Wort

Problem free

How to harvest St John’s Wort

Not usually harvested, unless for medicine. Pick as needed.

How to propagate St John’s Wort


Plant seeds in potting soil covered in a light layer of soil. Mist your seeds lightly and be careful not to over-water.


Carefully take divisions when plant is mature with full developed rhizome roots.


Take softwood cuttings during growing season.

Special features of St John’s Wort

Attracts useful insects

Bumblebees, Syrphid flies and beetles may feed on the pollen although they are less effective at pollination. Wasps and butterflies seeking for nectar which the flowers don't produce.

Other uses of St John’s Wort

Found in grassland. Medicinal use.


Medicinal herb with antidepressant activity and anti-inflammatory properties as an arachidonate 5-lipoxygenase inhibitor and COX-1 inhibitor.


Often grown as a garden specimen in borders.

Plants for Long Grass Areas

Above 50cm

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Hedgerow and Verges Mixed

Hardy annuals and perennials that can be seed sown for colour.

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