Pellitory (Parietaria judaica)

Also known as: asthma weed, pellitory of the wall


How does this weed affect you?

Pellitory ia a much-branched perennial herb, with sticky hairs, that grows up to one metre high that is Native of Europe, central and western Asia and northern Africa.

Leaves are green, soft, oval shape with pointed ends, and are 2cm to 8cm long and are arranged alternately along pink or red stems. Flowers are very small, light green in colour, and clustered long the stems.

Pellitory common weed on roadsides and in gardens and thrives in cracks especially against walls. It is a common weed in Sydney suburbs. 

Plants grow and produce seed very rapidly (within 2-3 weeks under favourable conditions). Regrowth is persistent, and plants can flower and set seed most of the year. The seeds are dispersed by wind, water and by attachment to humans and animals by sticky hairs.


Pellitory is mildly toxic to humans, causing skin irritation when plant hairs cling to clothing, and allergic reactions through the pollen which is produced throughout the year but copiously in spring. Reactions include asthma, conjunctivitis, hay fever and severe skin irritation. 

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Herbicide options

Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website

See Using herbicides for more information.

Glyphosate 360 g/L (Roundup®)
Rate: 1.0 L in 100 L of water
Comments: Apply to actively growing plants before flowering. Re-treatments may be required to control seedlings.
Withholding period: Nil.
Herbicide group: M, Inhibitors of EPSP synthase
Resistance risk: Moderate

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Biosecurity duty

The content provided here is for information purposes only and is taken from the Biosecurity Act 2015 and its subordinate legislation, and the Regional Strategic Weed Management Plans (published by each Local Land Services region in NSW). It describes the state and regional priorities for weeds in New South Wales, Australia.

Area Duty
All of NSW General Biosecurity Duty
All plants are regulated with a general biosecurity duty to prevent, eliminate or minimise any biosecurity risk they may pose. Any person who deals with any plant, who knows (or ought to know) of any biosecurity risk, has a duty to ensure the risk is prevented, eliminated or minimised, so far as is reasonably practicable.

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For technical advice and assistance with identification please contact your local council weeds officer.
For further information call the NSW DPI Biosecurity Helpline on 1800 680 244 or send an email to

Reviewed 2014