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do st johns wort weed seeds pop when touched

The fruit is a small capsule (5-10 mm long) containing numerous tiny seeds. These fruit are green and sticky when young, but turn reddish-brown or brown in colour and split open when fully mature. The seeds (about 1 mm long and 0.5 mm wide) are dark brown or blackish in colour, almost cylindrical in shape, and have a pitted or finely patterned (i.e. reticulate) surface.

For information on the management of this species see the following resources:

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St. John’s wort ( Hypericum perforatum ) is regarded as a significant environmental weed in Victoria and as an environmental weed in the ACT, New South Wales, South Australia and Western Australia. It is actively managed by community groups in Victoria, New South Wales and the ACT, and is listed as a priority environmental weed in six Natural Resource Management regions.

St. John’s wort ( Hypericum perforatum ) is similar to Canary Island St. John’s wort ( Hypericum canariense ), St. Peter’s wort ( Hypericum tetrapterum ), tangled hypericum ( Hypericum triquetrifolium ) and the native small St. John’s wort ( Hypericum gramineum ) and matted St. John’s wort ( Hypericum japonicum ). These species can be distinguished by the following differences:

Widely naturalised in southern and eastern Australia. It is most common in eastern and southern New South Wales, the ACT, Victoria, south-eastern South Australia and south-western Western Australia. Less common or occasionally naturalised in other parts of South Australia and Western Australia, in Tasmania, and in south-eastern Queensland.

St. John’s wort ( Hypericum perforatum ) is sometimes cultivated for use as a medicinal herb.

A relatively short lived herbaceous perennial that grows in a loose open bushy habit of tall reddish coloured stems up to 60–110cm (2–3ft) tall and 60cm (2ft) across spreading by seed and from a woody base which puts out runners. Flowering from May to September, the flowers are star shaped clusters of bright yellow–orange comprised of five petals spotted with black dots which when rubbed between the fingers deposits a red stain. They are 2.5cm (1in) across with many prominent yellow stamens which make them look rather like a fine brush. Fruits are a three celled capsule containing small, dark brown seeds. The whole plant has a turpentine smell. Rarely in the plant world St. John’s wort has two raised lines along the stem making it appear as if it were pressed flat.

opposite oval to linear leaves 2.5cm (1in) long. Found in roadsides, unimproved ground and fields it is a European, Northern Africa and Western Asian native, it has naturalised itself in the US and Australia where it is regarded as an invasive alien. Grows in full sun to part shade. Hypericum from the Greek for "above an icon" and Perforatum from the Latin for "perforated", as the leaves when backlit reveal many translucent spots, these are not actually holes but a layer of opaque essential plant oils and resin and a characteristic of most species of Hypericum. Wort is an old word meaning, "plant". Toxic to livestock. The flowers are uses in red and yellow dies.

St John’s Wort – Hypericum perforatum
Family – Hypericaceae
Also known as – Goat weed, Touch–and–heal, Rose of Sharon

FBCP do not advise or recommend that any part of St John’s Wort – Hypericum perforatum is eaten or used as an herbal remedy. Traditionally hung in windows and above photos to protect from evil spirits, extracts from the leaves and flowers have been useful in treating mild depression, anxiety and insomnia. St. John’s wort leaves and flowers were traditionally gathered on June 24th, St. John’s Day (birthday of John the Baptist), and made into an eye lotion and to guard against evil spirits. St. John’s wort is an ingredient in the traditional Russian soft drink, Baikal. Taking large amounts of St. John’s wort or its extracts is reported to cause increased photo–sensitivity and dermatitis in some people. St John’s Wort contains a photoxin, which is activated by exposure to sunlight. The translucent spots under the leaves contain a reddish, fluorescent substance which on activation by ultraviolet sunlight can cause dermatitis directly or, indirectly, in people using herbal medicines prepared from St John’s Wort.