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St John's Wort

St John's wort (Hypericum perforatum) is declared noxious in the Illawarra District Weeds Authority control area (including Kiama, Shellharbour and Wollongong council areas).

The weed control class is 4. This means that:

The growth of the plant must be managed in a manner that continuously inhibits the ability of the plant to spread and the plant must not be sold, propogated or knowingly distributed"

Description: An erect perennial herb or small shrub with a creeping rootstock.  Leaves when viewed against light show characteristic oil glands.  Flowers in spring, early summer bearing bright yellow flowers.  The dead brown flower stalks are clearly visible at other times during the year. A native of Europe and Western Asia

Problem: Very invasive, heavy seeder. The plant readily invades unimproved overgrazed pastures. It can be quite toxic, particularly to animals not accustomed to it.  Toxins in the leaves can cause photosensitivity, hypersensitivity (heat and cold stress) and infertility in grazing animals.  It has been used for a range of alternative medicines, but can have severe side effects in humans, including death.

Control Plan: Click here

For more detailed information click here