Galenia (Galenia pubescens)

Also known as: coastal galenia, carpet weed

Galenia was originally planted for erosion control at mining sites. It is now a troublesome weed throughout southern Australia.

Profile

How does this weed affect you?

Drought and salt tolerant, galenia grows over and smothers existing vegetation by forming a thick dense mat. It invades coastal dunes, pastures, disturbed areas, lawns, roadsides and rocky outcrop vegetation. Galenia is known to produce nitrates that can be toxic to stock.

Bees that collect the nectar of galenia produce honey with such a disagreeable flavour that is unsaleable.

Where is it found?

Native to South Africa. It has now naturalised in the USA, Spain and Chile.

Galenia is scattered throughout many sites in NSW, Victoria, South Australia and Western Australia. It is of particular concern through the Hunter Valley and Liverpool Plains regions of NSW.

In Victoria it is spreading throughout the outer western suburbs of Melbourne, stretching into the western districts and encroaching into conservation areas. In South Australia galenia is an environmental weed that is problematic along the west coast of the Eyre and York Peninsulas. 

Maps and records

• Recorded presence of Galenia during property inspections (Map: Biosecurity Information System - Weeds, 2017-2024)
  These records are made by authorised officers during property inspections under the Biosecurity Act 2015. Officers record the presence of priority weeds in their council area and provide this to the NSW Department of Primary Industries. Records reflect the presence of the weed on the date of inspection.
  
  

How does it spread?

Galenia reproduces by seed. Most dispersal of seed occurs by wind, water, birds and livestock. Movement of contaminated soil by vehicles and equipment can also contribute to its spread.

Lifecycle

A deep rooted perennial herb that flowers from late spring to early autumn.

What does it look like?

A perennial creeping, herbaceous plant growing to about 60 cm high and 1–2 m wide.

Stems

• woody at the base
• covered in scale-like hairs 0.3–0.7 mm long

Leaves

• alternate
• slightly succulent
• greyish-green in colour
• hairy
• oblong to spoon-shaped with smooth edges and pointed tips
• 0.4–2.5 cm long and 0.2–2 cm wide

Flower

• small, 4–6 mm across
• occur as a single flower in the leaf fork
• 5 small petals, 2-3 mm long
• white, greenish-white or pinkish in colour

Fruit

• a small capsule
• 2.5–3 mm long and about 1 mm wide
• usually contains 5 seeds

Seed

• circular to kidney-shaped
• dark red to brown in colour
• about 1.5 mm long
• has rows of small bumps along its length

What type of environment does it grow in?

Preferring a temperate climate of wet winters and long, dry summers, galenia will also grow in semi-arid and sub-tropical environments. Galenia thrives in a variety of soil types, ranging from stony, sandy and loams. It will quickly invade neglected areas, but will also encroach into pastures and relatively undisturbed environmental areas. It is a considerable threat to coastal dunes.

Acknowledgements

Written by Rachele Osmond

Reviewed by Rod Ensbey

References

Australia’s Virtual Herbarium (2007) Council Heads of Australian Herbaria (CHAH) Available at: http://avh.chah.org.au. Accessed August 2014.

Department of Employment, Economic Development and Innovation (2011) Coastal galenia: Galenia pubescens var. pubescens, Queensland Government. Accessed August 2014.

Department of the Environment (2011) Weeds in Australia: Galenia pubescens. Australian Government. www.environment.gov.au/biodiversity/invasive/weeds/identification/index.html. Accessed August 2014. 

Ensbey, R (2011) Noxious and environmental weed control handbook. NSW Department of Primary Industries, Orange. Available at http://www.dpi.nsw.gov.au/agriculture/pests-weeds/weeds/publications/noxious-enviro-weed-control

Hosking JR, Sainty GR, Jacobs SWL & Dellow JJ (in prep) The Australian WeedBOOK.

More information

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Control

Small infestations and individual plants may be removed by hand pulling or digging out. Make sure to remove the large taproot, otherwise plants will regrow.

Removing large infestations can potentially leave significant areas of bare ground. Consider revegetating these areas following control.

Herbicide control

Galenia is a difficult weed to control and will require consistent treatments, using a registered herbicide. Best applied using a foliar spray, when plants are actively growing, during spring and summer on fresh, new growth.

Always check controlled areas and re-treat as necessary.

Herbicide options

See Using herbicides for more information.

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Picloram 100 g/L + Triclopyr 300 g/L + Aminopyralid 8 g/L (Grazon Extra®)
Rate: 500 mL per 100 L of water
Comments: Spray with a handgun. Use 200 L spray mixture per ha (i.e. 20 L/100 m2 infested area). Thoroughly cover all of the foliage to the point of run-off.
Withholding period: Where product is used to control woody weeds in pastures there is a restriction of 12 weeks for use of treated pastures for making hay and silage; using hay or other plant material for compost, mulch or mushroom substrate; or using animal waste from animals grazing on treated pastures for compost, mulching, or spreading on pasture/crops.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
Resistance risk: Moderate

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Picloram 100 g/L + Triclopyr 300 g/L + Aminopyralid 8 g/L (Grazon Extra®)
Rate: 3 - 5 L/ha (Apply a minimum volume of 200 L of spray mixture/ha)
Comments: Boom spray fresh growth during spring to summer. Use the low rate for seedling weeds less than 50 cm after significant rain of 25 mm or more. When using the lower rate add Pulse ™ Penetrant at 100 mL/100 L for best control.
Withholding period: Where product is used to control woody weeds in pastures there is a restriction of 12 weeks for use of treated pastures for making hay and silage; using hay or other plant material for compost, mulch or mushroom substrate; or using animal waste from animals grazing on treated pastures for compost, mulching, or spreading on pasture/crops.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
Resistance risk: Moderate

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Triclopyr 300 g/L + Picloram 100 g/L (Various products)
Rate: 500 mL per 100 L of water
Comments: Spray all of the foliage to the point of run off. Fresh spring/summer growth. For a handgun use 2000 L mixture / ha (i.e. 20 L/ 100 m2). For knapsack use 2 L /10 m2.
Withholding period: Nil.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
Resistance risk: Moderate

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Triclopyr 300 g/L + Picloram 100 g/L (Various products)
Rate: 5 L/ha
Comments: Boom spray application (Apply a minimum volume of 200 L of spray mixture/ha).
Withholding period: Nil.
Herbicide group: 4 (previously group I), Disruptors of plant cell growth (Auxin mimics)
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 pest 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.
Hunter An exclusion zone is established for all land in the region, except the core infestation which includes parts of: Lake Macquarie Local Government Area, Maitland Local Government Area, Muswellbrook Local Government Area, Newcastle Local Government Area, Singleton Local Government Area, Upper Hunter Local Government Area.	Regional Recommended Measure* (for Regional Priority - Containment) Entire Hunter Local Land Services region: Land managers should mitigate the risk of the plant being introduced to their land. Exclusion zone: Notify local control authority if found. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Core infestation: Land managers should mitigate spread of the plant from their land. A person should not buy, sell, move, carry or release the plant into the environment. Land managers should reduce the impact of the plant on assets of high economic, environmental and/or social value.
	*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfil the general biosecurity duty for this weed click here

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Reviewed 2024