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A picture of a St John's Wort

St John's Wort

Hypericum perforatum

Also known as

Perforate St John's-Wort, Common Saint John's Wort, Chase-Devil, Klamath Weed

Full Sun
Moderate care
Moderate watering
Frost Hardy

Expected size

Height
Spread

2.5m

Max

1.5m

1m

Min

1m

3 years to reach maturity

Flowering

  • spring
  • summer
  • autumn
  • winter

This plant has a mild fragrance

More images

A photo of St John's Wort
A photo of St John's Wort
A photo of St John's Wort
A photo of St John's Wort
A photo of 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

Problem free

    Harvesting

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

    Propagation

    Seed

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

    Division

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

    Cuttings

    Take softwood cuttings during growing season.

    Special Features

    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.

    Uses

    Medicinal

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

    Ornamental

    Often grown as a garden specimen in borders.