List of invasive plant species in California

A list of invasive plant species in California.

Numerous plants have been introduced to the California Floristic Province and within the state's borders. Many of them have become invasive species and/or noxious weeds. The following are some of these species:

List

 * Acacia dealbata—silver wattle
 * Acacia melanoxylon—blackwood acacia
 * Acacia paradoxa—paradox acacia
 * Agrostis avenacea—Pacific bentgrass
 * Ailanthus altissima—tree-of-heaven
 * Aira caryophyllea
 * Allium neapolitanum—white garlic
 * Alliaria petiolata
 * Alternanthera philoxeroides—alligatorweed
 * Alternanthera sessilis—sessile joyweed
 * Ammophila arenaria
 * Ammophila breviligulata
 * Ampelodesmos
 * Andropogon virginicus
 * Arctotheca calendula—capeweed
 * Artemisia biennis
 * Anthoxanthum odoratum—sweet vernal grass
 * Arundo donax—giant reed
 * Asparagus aethiopicus
 * Asparagus asparagoides—bridal creeper
 * Atriplex lindleyi
 * Atriplex rosea
 * Atriplex semibaccata—Australian saltbush
 * Atriplex suberecta
 * Avena barbata—slender oat
 * Avena fatua—wild oats
 * Avena sterilis—animated oat
 * Azolla pinnata
 * Brachypodium distachyon—annual false-brome
 * Brachypodium sylvaticum—slender false-brome
 * Brassica nigra—black mustard
 * Brassica rapa-field mustard
 * Brassica tournefortii
 * Briza maxima—rattlesnake grass
 * Bromus alopecuros
 * Bromus arenarius
 * Bromus catharticus
 * Bromus commutatus
 * Bromus diandrus—ripgut brome
 * Bromus hordeaceus—soft chess
 * Bromus madritensis ssp. rubens—red brome
 * Bromus secalinus
 * Bromus sterilis
 * Bromus tectorum—cheatgrass
 * Broom (plant)
 * Cardaria draba—whitetop
 * Carduus acanthoides
 * Carduus crispus
 * Carduus nutans—musk thistle
 * Carduus pycnocephalus—Italian thistle
 * Carduus tenuiflorus—winged plumeless thistle
 * Carpobrotus chilensis—sea-fig
 * Carpobrotus edulis—iceplant
 * Castor oil plant
 * Caulerpa taxifolia
 * Centaurea calcitrapa—purple starthistle
 * Centaurea diffusa—diffuse knapweed
 * Centaurea iberica—Iberian knapweed
 * Centaurea solstitialis—yellow starthistle
 * Centaurea sulphurea—sulphur knapweed
 * Centaurea virgata—squarrose knapweed
 * Chenopodiastrum murale
 * Chenopodium vulvaria
 * Chloris gayana
 * Cirsium arvense—Canada thistle
 * Cirsium ochrocentrum—yellowspine thistle
 * Cirsium vulgare—bull thistle
 * Cistus monspeliensis
 * Conium
 * Cordyline australis—New Zealand cabbage tree
 * Cortaderia jubata—pampasgrass
 * Cortaderia selloana—white pampasgrass
 * Cotoneaster franchetii—Cotoneaster
 * Cotoneaster lacteus—Parney's Cotoneaster
 * Cotoneaster pannosus—silverleaf cotoneaster
 * Crataegus monogyna—common hawthorn
 * Crocosmia x crocosmiiflora—montbretia
 * Cynara cardunculus—cardoon thistle
 * Cynanchum louiseae
 * Cynodon dactylon—Bermuda grass
 * Cyperus rotundus
 * Cytisus multiflorus
 * Cytisus scoparius—Scotch broom
 * Cytisus striatus—Portuguese broom
 * Dactylis glomerata—orchard grass
 * Dactyloctenium aegyptium
 * Delairea odorata—Cape ivy, German ivy
 * Digitalis purpurea—foxglove
 * Diplotaxis muralis
 * Diplotaxis tenuifolia
 * Dittrichia graveolens
 * Echium candicans—pride-of-Madeira
 * Eichhornia crassipes—water hyacinth
 * Elaeagnus angustifolia—Russian olive
 * Equisetum—horsetail
 * Equisetum hyemale—scouringrush horsetail
 * Eragrostis cilianensis—candy grass
 * Erica lusitanica—Spanish heath
 * Erodium botrys—broadleaf filaree
 * Erodium cicutarium—redstem filaree
 * Erysimum repandum
 * Eucalyptus camaldulensis—red gum
 * Eucalyptus globulus—blue gum
 * Euphorbia peplus
 * Fallopia baldschuanica
 * Fennel
 * Festuca arundinacea—coarse fescue
 * Festuca myuros—red-tailed fescue
 * Ficus carica—edible fig
 * Foeniculum vulgare—fennel
 * Gazania linearis—gazania
 * Genista canariensis—Canary Islands broom
 * Genista linifolia—Mediterranean broom
 * Genista monosperma—bridal veil broom
 * Genista monspessulana—French broom
 * Geranium dissectum—cutleaf geranium
 * Geranium molle—covesfoot cranesbill
 * Glyceria declinata—mannagrass
 * Hedera canariensis—Algerian ivy
 * Hedera helix—English ivy
 * Hedypnois cretica
 * Helichrysum petiolare—licorice plant
 * Hirschfeldia incana—Mediterranean mustard
 * Heteranthera limosa
 * Holcus lanatus—velvet grass, Yorkshire fog
 * Hordeum marinum—Mediterranean barley
 * Hordeum murinum—hare barley
 * Hyparrhenia hirta
 * Hypericum canariense—Canary Island St John's wort
 * Hypericum grandifolium—large-leaved St John's wort
 * Hypericum perforatum—St John's Wort
 * Ilex aquifolium—English holly
 * Ipomoea cairica—Coast Morning Glory
 * Ipomoea indica—blue morning glory
 * Iris missouriensis—western blue flag iris
 * Iris pseudacorus—yellowflag iris
 * Ivy
 * Kali tragus
 * Koenigia polystachya (syn. Polygonum polystachyum)
 * Lantana montevidensis—purple lantana
 * Leucanthemum vulgare—ox-eye daisy
 * Ligustrum ovalifolium—California privet
 * Limnobium laevigatum
 * Limonium perezii—sea lavender
 * Limonium ramosissimum ssp. provincale—Algerian sea lavender
 * Lobularia maritima—sweet alyssum
 * Lolium multiflorum—Italian ryegrass
 * Ludwigia hexapetala—creeping waterprimrose
 * Malva nicaeensis
 * Marrubium vulgare—horehound
 * Medicago polymorpha—burclover
 * Melilotus indicus
 * Mentha pulegium—pennyroyal
 * Mesembryanthemum crystallinum—common iceplant
 * Myoporum laetum—myoporum
 * Myosotis latifolia—common forget-me-not
 * Myriophyllum aquaticum—parrotfeather
 * Myriophyllum spicatum—spike watermilfoil
 * Nassella manicata—Andean tussockgrass
 * Nicotiana glauca—tree tobacco
 * Nymphaeaceae—water lilies
 * Oenothera glazioviana—redsepal evening primrose
 * Olea europaea—olive
 * Onopordum acanthium—Scotch thistle
 * Oncosiphon pilulifer-sinkweed
 * Oxalis pes-caprae—Bermuda buttercup
 * Parietaria judaica—spreading pellitory
 * Paspalum dilatatum—dallisgrass
 * Pennisetum clandestinum—kikuyugrass
 * Pennisetum setaceum—fountain grass
 * Phalaris aquatica—harding grass
 * Phoenix canariensis—Canary Island date palm
 * Piptatherum miliaceum—smilo grass
 * Pistacia atlantica
 * Plantago lanceolata—English plantain
 * Poa pratensis—Kentucky bluegrass
 * Polygonum arenastrum
 * Polypogon australis—beardgrass
 * Prunus cerasifera—cherry plum
 * Prunus lusitanica—Portuguese laurel
 * Psathyrostachys juncea
 * Puccinellia distans
 * Pyracantha angustifolia—narrowleaf firethorn
 * Pyracantha coccinea—European firethorn
 * Pyracantha crenulata—firethorn
 * Ranunculus repens—creeping buttercup
 * Raphanus sativus—wild radish
 * Retama monosperma—bridal veil broom
 * Reynoutria japonica (syn. Polygonum cuspidatum)—Japanese knotweed
 * Ricinus communis—castor bean
 * Robinia pseudoacacia—black locust
 * Rubus armeniacus—Himalayan blackberry
 * Rubus laciniatus—barbwire Russian thistle
 * Rumex crispus—curly dock
 * Saccharum ravennae—ravennagrass
 * Salsola paulsenii—barbwire Russian thistle
 * Salsola soda—oppositeleaf Russian thistle
 * Salsola tragus—Russian thistle
 * Salvia aethiopis—African sage
 * Schinus molle—Peruvian/California pepper tree
 * Schinus terebinthifolius—Brazilian pepper tree
 * Setaria verticillata
 * Silybum marianum—milk thistle
 * Sinapis arvensis—canola
 * Solanum elaeagnifolium
 * Solanum lanceolatum
 * Spartina alterniflora—smooth cordgrass
 * Spartina densiflora—Chilean cordgrass
 * Spartina patens—Salt marsh hay
 * Spartium—broom
 * Spartium junceum—Spanish broom
 * Stipa capensis—cape ricegrass
 * Tamarix aphylla—athol
 * Tamarix chinensis—Chinese tamarisk
 * Tamarix gallica—French tamarisk
 * Tamarix parviflora—smallflower tamarisk
 * Tamarix ramosissima—salt cedar, tamarisk
 * Tanacetum vulgare—common tansy
 * Tetragonia tetragonioides—New Zealand spinach
 * Torilis arvensis—spreading hedgeparsley
 * Trifolium angustifolium
 * Trifolium dubium
 * Trifolium hirtum—rose clover
 * Trisetum flavescens
 * Ulex—gorse
 * Ulex europaeus—common gorse
 * Undaria pinnatifida—wakame
 * Verbascum thapsus—wooly mullein
 * Vinca
 * Vinca major—periwinkle
 * Vinca minor—dwarf periwinkle
 * Viola labradorica
 * Vulpia myuros
 * Wakame
 * Washingtonia robusta—Mexican fan palm
 * Watsonia meriana—watsonia
 * Zantedeschia aethiopica—calla lily
 * Zostera japonica—Japanese eelgrass