The plants listed here have all been introduced into southern Africa, either intentionally or not, and have become naturalised to the extend where they can spread without the aid of human intervention. They have established themselves in the southern Cape region and are threatening both natural ecosystems and agricultural productivity. By being included in this list does not automatically brand a plant as undesirable and to be eradicated in all situations, because many of the species are grown commercially or are cultivated in parks and gardens. It is only when a plant “escapes” and grows in places considered undesirable, like conservation areas and along watercourses, that it should be removed.
- Acacia baileyana – Bailey’s Wattle; Bailey-se-wattel
- Acacia cyclops – Red Eye; Rooikrans
- Acacia dealbata – Silver Wattle; Silwerwattel
- Acacia elata – Peppertree Wattle; Peperboomwattel
- Acacia longifolia – Long-leaved Wattle; Langblaarwattel
- Acacia mearnsii – Black Wattle; Swartwattel
- Acacia melanoxylon – Australian Blackwood; Australiese Swarthout
- Acacia podalyriifolia – Pearl Acacia; Vaalmimosa
- Acacia pycnantha – Golden Wattle; Gouewattel
- Acacia saligna – Port Jackson Willow; Port Jackson
- Achillea millefolium – Common Yarrow, Milfoil; Duisendblaar-achillea
- Agave americana – American Agave; Garingboom
- Agave sisalana – Sisal
- Ailanthus altissima – Tree-of-heaven; Hemelboom
- Alternanthera pungens – Khakiweed, Paperthorn, Khaki Burweed; Kakiedubbeltjie
- Amaranthus deflexus – Perennial Pigweed; Meerjarige Misbredie
- Amaranthus hybrides – Common Pigweed, Cape Pigweed, Redshank; Gewone Misbredie, Kaapse Misbredie
- Amaranthus viridis – Slender Amaranth; Skraal Misbredie
- Ammi majus – Lace Flower, Queen Anne’s Lace; Kantblom
- Araujia sericifera – Moth Catcher; Motvanger
- Arundo donax – Giant Reed; Spaansriet
- Atriplex lindleyi subsp. inflata – Sponge-fruit Saltbush; Blasiesoutbos
- Atriplex nummularia subsp. nummularia – Old Man Saltbush; Oumansoutbos
- Avena barbata – Slender Wild Oats; Wildebaardhawer
- Avena byzantina – Red Oats; Rooihawer
- Avena fatua – Common Wild Oats; Gewone Wildehawer
- Avena sterilis – Tall Wild Oats; Groot Wildehawer
- Bidens bipinnata – Spanish Blackjack; Spaanse Knapsekêrel
- Bidens formosa – Cosmos; Kosmos, Mieliepes
- Bidens pilosa – Common Blackjack; Gewone Knapsekêrel
- Briza maxima – Large Quaking Grass; Bewertjies
- Briza minor – Small Quaking Grass; Kleinbewertjies
- Bromus catharticus – Rescue Grass; Reddingsgras
- Bromus diandrus – Ripgut Brome; Predikantsluis
- Bromus pectinatus – Japanese Brome; Hooigras
- Casuarina cunninghamiana – Beefwood; Kasuarisboom
- Casuarina equisetifolia – Horsetail Tree; Perdestertboom
- Cenchrus incertus – Mat Sandbur; Dubbeltjiegras
- Cereus jamacaru – Queen of the Night; Nagblom
- Cirsium vulgare – Scotch Thistle; Skotse Dissel
- Cortaderia selloana – Pampas Grass; Pampasgras
- Cuscuta campestris – Common Dodder; Gewone Dodder
- Cuscuta suaveolens – Lucerne Dodder; Luserndodder
- Datura stramonium – Common Thorn Apple; Gewone Stinkblaar
- Echinopsis spachiana – Torch Cactus; Orrelkaktus
- Echium plantagineum – Patterson’s Curse; Pers Echium
- Echium vulgare – Blue Echium; Blou Echium
- Eichhornia crassipes – Water Hyacinth; Waterhiasint
- Eucalyptus camaldulensus – Red River Gum; Rooibloekom
- Eucalyptus cladocalyx – Sugar Gum; Suikerbloekom
- Eucalyptus diversicolor – Karri; Karie
- Eucalyptus lehmannii – Spider Gum; Spinnekopbloekom
- Foeniculum vulgare – Wild Fennel; Vinkel
- Gomphrena celosioides – Prostrate Globe Amaranth, Bachelor’s Button; Kruip-knopamarant, Mierbossie
- Hakea drupacea – Sweet Hakea; Soethakea
- Hakea gibbosa – Rock Hakea; Harige Hakea
- Hakea sericea – Silky Hakea; Syerige Hakea
- Hordeum murinum – Wild Barley, False Barkey, Mouse Barley; Wildegars, Muiswildegars
- Hypericum perforatum – St. John’s Wort; Johanneskruid
- Lagurus ovatus – Hare’s Tail; Haasstert
- Lantana camara – Lantana
- Leptospermum laevigatum – Australiese Myrtle; Australiese Mirt
- Lolium multiflorum – Italian Ryegrass, Annual Ryegrass; Italiaanse Raaigras
- Lolium perenne – Perennial Ryegrass; Meerjarige Raaigrass
- Lolium temulentum – Darnel; Drabok
- Melia azedarach – Syringa; Sering
- Melinis repens – Natal Red-top; Natalse Rooipluim
- Morus alba – White Mulberry; Witmoerbei
- Myoporum tenuifolium subsp. montanum – Manatoka
- Myriophyllum spicatum – Spiked Water-milfoil
- Nassella trichotoma – Nassella Tussock; Nassella-polgras
- Nerium oleander – Oleander; Selonsroos
- Nicotiana glauca – Wild Tobacco; Wildetabak
- Opuntia ficus-indica – Sweet Prickly Pear; Boereturksvy
- Opuntia imbricata – Imbricate Prickly Pear; Kabelturksvy
- Paraserianthes lophantha – Stink Bean; Stinkboon
- Paspalum notatum – Lawn Paspalum, Bahia Paspalum; Turfpaspalum, Bahiagras
- Passeflora caerulea – Blue Passion Flower; Siergrenadella
- Pennisetum clandestinum – Kikuyu Grass; Kikoejoegras
- Pennisetum setaceum – Fountain Grass; Pronkgras
- Pennisetum villosum – Feathertop; Veergras
- Phalaris canariensis – Common Canary Grass; Gewone Kanariegras
- Phalaris minor – Little-seeded Canary Grass; Kleinsaadkanariegras
- Pinus canariensis – Canary Pine; Kanariese Den
- Pinus halepensis – Aleppo Pine; Aleppoden
- Pinus pinaster – Cluster Pine; Trosden
- Pinus pinea – Umbrella Pine; Sambreelden
- Pinus radiata – Radiata Pine; Radiataden
- Poa annua – Annual Blue Grass, Winter Grass; Eenjarige Blougras, Wintergras
- Polypogon monspeliensis – Beard Grass, Rabbit’s Foot; Brakbaardgras, Brakgras
- Populus x canescens – Grey Poplar; Vaalpopulier
- Prosopis glandulosa var. torreyana – Honey Mesquite; Heuningprosopis
- Psidium guajava – Guava; Koejawel
- Pyracantha angustifolia – Yellow Firethorn; Geelbranddoring
- Quercus robus – Englisk Oak; Akkerboom
- Ricinus communis – Castor-oil Plant; Kasterolieboom
- Robinia pseudoacacia – Black Locust; Witakasia
- Rorippa nasturtium-aquaticum – Watercress; Bronkors
- Rosa eglanteria – Sweetbriar; Wilderoos
- Rubus cuneifolius
- Rubus flagellaris
- Rubus fruticosus – European Blackberry; Braam
- Rubus x proteus
- Salix babylonica – Weeping Willow; Treurwilger
- Salsola kali – Russian Tumbleweed; Russiese Rolbossie
- Salvinia molesta – Kariba Weed; Watervaring
- Schinus molle – Pepper Tree; Peperboom
- Sesbania punicea – Red Sesbania; Rooisesbania
- Solanum elaeagnifolium – Silver-leaf Bitter Apple; Satansbos
- Solanum mauritianum – Bugweed; Luisboom
- Spartium junceum – Spanish Broom; Spaanse Besem
- Tamarix ramosissima – Pink Tamarisk; Perstamarisk
- Vulpia myuros – Rat’s Tail Fescue; Wildegars, Langbaardswenkgras
- Xanthium spinosum – Spiny Cocklebur; Boetebossie
- Zaleya pentandra – African Purslane; Muisvygie