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Weeds to Watch

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We have included a list of ‘Weeds to Watch’ as we are not able to comprehensively cover, with an individual fact sheet, all the weeds present in, or threatening, the Molonglo Catchment. These weeds are known to be problematic in other regions. Some of these species may be considered ‘sleeper weeds’ – plants that are present in an area in small numbers and have the potential, with a slight change of conditions, to spread widely and have significant impacts. Climate change could be the driver of such weed spread and therefore, now, more than ever, it is advisable to keep these weeds on your radar and source further information to enable accurate identification and control.

This is by no means a comprehensive list of potential problem weeds, however it does cover a broad range of weeds including all those from the ACT Pest Plants List 2005 and the relevant sections of the ‘Regional Weed Strategy – Murrumbidgee Catchment’ (2007).



Alligator weed

Alternanthera philoxeroides

Athel pine (athel tree)

Tamarix aphylla

Barley grass

Hordeum spp.

Bitou bush & boneseed

Chrysanthemoides monilifera & Chrysanthemoides monilifera sub. sp. monilifera

Black alder

Alnus glutinosa

Black knapweed

Centaurea nigra

Black wattle

Acacia decurrens

Box elder maple

Acer negundo

Bracelet honey-myrtle

Melaleuca armillaris


Pteridium esculentum

Bridal creeper

Asparagus asparagoides

Broad-kernel espartillo

Achnatherum caudatum


Orobanche spp. (except the native O. cernua var. australiana and O. minor)

Buffalo burr

Solanum rostratum


Cabomba caroliniana


Tribulus terrestris


Arctotheca calendula

Chinese violet

Asystasia gangetica (subspecies mircantha)

Coastal wattle

Acacia longifolia var sophorae

Coolatai grass

Hyparrhenia hirta

Cotoneaster (grey, large-leaf, silver-leaf, willow-leaf, Himalayan)

Cotoneaster spp. (franchetii, glaucophyllus, pannosus, salicifolius, simonsii)

Devil’s claw

Ibicella lutea / Probosidea louisianica


Rumex spp.


Cuscuata spp. (except native spp.)

East Indian hygrophila

Hygrophila polysperma

English ivy

Hedera helix

Eurasian water milfoil

Myriophyllum spicatum

Fat hen

Chenopodium album


Foeniculum vulgare

Firethorn/pyracantha (& scarlet firethorn)

Pyracantha spp. (angustifolia, fortuneana & coccinea)

Great mullein

Verbascum thapsus

Green cestrum

Cestrum parqui

Guildford grass, onion grass

Romulea rosea


Hieracium spp.


Conium maculatum


Equisetum spp.


Hymenachne amplexicaulis

Japanese honeysuckle

Lonicera japonica

Johnson grass

Sorghum halepense

Karoo thorn

Acacia karroo


Bassia scoparia / Kochia scoparia


Lagarosiphon major


Lantana camara

Lobed needlegrass

Nassella charruana

Longstyle feathergrass

Pennisetum villosum


Prosopis spp.

Mexican feather grass

Nassella tenuissima Stipa tenuissima


Miconia spp.


Mimosa pigra

Mount Morgan wattle / Queensland silver wattle

Acacia podalyriifolia

Nettle tree

Celtis australis

Pampas grass (pink  & common)

Cortaderia spp. (jubata & selloana)


Parkinsonia aculeate

Parrot’s feather

Myriophyllum aquaticum

Parthenium weed

Parthenium hysterophorous

Perennial Canada thistle

Cirsium arvense

Periwinkle/blue periwinkle

Vinca major

Pond apple

Annona glabra

Prairie ground cherry

Physalis viscosa / physalis virginiana

Prickly acacia

Acacia nilotica

Prickly pears

Opuntia & Cylindropuntia spp.


Verbena spp.


Senecio jacobaea

Rosemary grevillea

Grevillea rosmarinifolia

Rubber vine

Cryptostegia grandiflora

Saffron thistle

Carthamus lanatus


Salvinia molesta

Senegal tea plant

Gymnocoronis spilanthoides

Service tree, rowan

Sorbus spp. (domestica and aucuparia)

Siam weed

Chromolaena odorata

Sifton bush

Cassinia arcuata

Silverleaf nightshade

Solanum elaeagnifolium

Slender thistle

Carduus spp. (pycnocephalus & tenuiflorus)

Snowy River wattle

Acacia boormanii


Rumex acetosella

Spanish broom

Spartium junceum

Spear thistle

Cirsium vulgare

Spiny burrgrass

Cenchrus incertus / Cenchrus longispinus

Spotted knapweed

Centaurea maculosa

Storksbill, wild geranium

Erodium spp.


Datura spp.


Vulpia spp.

Water caltrop

Trapa spp.

Water hyacinth (& anchored water hyacinth)

Eichhorina spp. (crassipes & azurea)

Water lettuce

Pistia stratiotes

Water soldier

Stratiotes aloides

White Sally wattle

Acacia floribunda

Wild radish

Raphanus raphanistrum

Willow-leaved hakea

Hakea salicifolia


Polygonum aviculare


Striga spp (except native spp & Striga parviflora)

Yellow bamboo

Phyllostachys aurea

Yellow burrhead

Limnocharis flava

Yorkshire fog

Holcus lanatus

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Last modified: 17/01/2014