Government has evaluated more than 300 terrestrial and aquatic plant species to determine likelihood of occurrence, establishment and spread as well as to determine which pose the greatest threat. 48 plant species are candidates for early detection and rapid response activities and 118 other species are recommended for other levels of management.

There are 5 priority categories. A plant's priority category determines the province's response.

  1. Prevent
  2. Early detection and rapid response (EDRR)
  3. Provincial Containment
  4. Regional containment/control
  5. Management

The plants on this page are organized into these categories. 

View the information below in a table format


These species are determined to be high risk to B.C. and are not yet established. Management objective is prevent the introduction and establishment.


Alhagi maurorum

Eggleaf spurge

Eggleaf spurge (PDF, 2MB)
Euphorbia oblongata


Hydrilla (PDF, 585KB)
Hydrilla verticillata


Sorghum halepense​

Meadow Clary

Meadow Clary (PDF, 526KB) 
Salvia pratensis​

Purple nutsedge

Purple nutsedge (PDF, 127KB)  
Cyperus rotundus

Silverleaf nightshade

Silverleaf nightshade
Solanum elaeagnifolium

Spring milletgrass

Spring milletgrass
Milium vernale

Syrian bean-caper

Syrian bean-caper
Zygophyllum fabago​

Clary sage

Clary sage
Salvia sclarea


Galega officinalis

Iberian starthistle

Iberian starthistle
Centaurea iberica​

Jointed goatgrass

Jointed goatgrass (PDF, 356KB) 
Aegilops cylindrica

Mediterranean sage

Mediterranean sage
Salvia aethiopis​

Purple starthistle

Purple starthistle
Centaurea calcitrapa​

Slender/Meadow foxtail

Slender/Meadow foxtail
Alopecurus myosuroides​

Spurge Flax

Spurge Flax
Thymelaea passerina​

Texas Blueweed

Texas Blueweed
Helianthus ciliaris​

Common crupina

Common crupina
Crupina vulgaris


Halogeton glomeratus​

Italian thistle

Italian thistle
Carduus pycnocephalus


Kudzu (PDF, 810KB)  
Pueraria montana var. lobata


Medusahead (PDF, 766KB)
Taeniatherum caput-medusae​

Red bartsia

Red bartsia
Odontites serotina

Slenderflower thistle/winged thistle

Slenderflower thistle/winged thistle
Carduus tenuiflorus​

Squarrose knapweed

Squarrose knapweed (PDF, 113KB) 
Centaurea virgata ssp. squarrosa

Water soldier

Water soldier
Stratiotes aloides​

Early detection and rapid response (EDRR)

Learn more about the provincial EDRR.

These species are high risk to B.C. and are new to the Province. Management objective is eradication.

African rue

African rue
Peganum harmala​

Dyer's woad
Isatis tinctoria​

Giant reed
Arundo​ donax 

Hawkweed, mouse ear (PDF, 530KB) 
Hieracium pilosella​

Shiny geranium (PDF, 1.9MB)
Geranium lucidum

Water lettuce
Pistia stratiotes

Black henbane

Black henbane (PDF, 359KB) 
Hyoscyamus niger

European common reed  (PDF, 558KB)  
Phragmites australis​

Invasive cordgrasses
Spartina spp.​

North Africa grass (PDF, 525KB) 
Ventenata dubia​

Slender False brome (PDF, 1MB) 
Brachypodium sylvaticum subsp. sylvaticum​

Yellow floating heart (PDF, 835KB)
Nymphoides peltata​

Brazilian Elodea/Waterweed (PDF, 506KB) 
Egeria densa

Flowering rush (PDF, 508KB)  
Butomus umbellatus

Maltese star thistle
Centaurea melitensis​

Perennial pepperweed (PDF, 592KB) 
Lepidium latifolium

Water hyacinth
Eichhornia crassipes

Yellow starthistle (PDF, 134KB) 
Centaurea solstitialis

Provincial containment

Species is high risk with limited extent in B.C. but significant potential to spread. Management objective is to prevent further expansion into new areas with the ultimate goal of reducing the overall extent.

Garlic mustard (PDF, 346KB) 
Alliaria petiolata​

Rush skeletonweed (PDF, 151KB)  
Chondrilla juncea

Giant hogweed (660KB)
Heracleum mantegazzianum

Wild chervil (PDF, 132KB)
Anthriscus sylvestris

Poison hemlock (PDF, 550KB) 
Conium maculatum

Wild Parsnip
Pastinaca sativa

Regional containment/control

Species is high risk and well established, or medium risk with high potential for spread. Management objective is to prevent further expansion into new areas within the region through establishment of containment lines and identification of occurrences outside the line to control. 

Blueweed (PDF, 135KB) 
Echium vulgare

Field scabious (PDF, 137KB)   
Knautia arvensis

Hoary alyssum (PDF, 133KB) 
Berteroa incana

Leafy spurge (PDF, 154KB)  
Euphorbia esula

Policeman's helmet/Himalayan balsam
Impatiens glandulifera​

Spotted knapweed (PDF, 169KB) 
Centaurea stoebe

Yellow archangel
Lamium galeobdolon

Common bugloss  (PDF, 125KB) 
Anchusa officinalis​

Himalayan blackberry
Rubus armeniacus​

Hoary cress (PDF, 160KB)
Cardaria draba

Marsh plume thistle / marsh thistle (PDF, 157KB) 
Cirsium palustre

Puncturevine (PDF, 124KB) 
Tribulus terrestris​

Teasel (PDF, 665KB)
Dipsacus fullonum​

Yellow flag iris
Iris pseudacorus

Common tansy (PDF, 150KB) 
Tanacetum vulgare

Himalayan knotweed
Persicaria wallichii​

Knotweeds (Japanese, Giant and Bohemian)
Fallopia/Reynoutria and Polygonum  spp.

Orange hawkweed (PDF, 166KB)    Hieracium aurantiacum​

Scotch broom
Cytisus scoparius​

Whiplash hawkweed
Hieracium flagellare​



Species is more widespread but may be of concern in specific situations with certain high values - for example, conservation lands, specific agriculture crops. Management objective is to reduce the invasive species impacts locally or regionally, where resources are available.

Bur chervil
Anthriscus caucalis​

Eurasian water milfoil (PDF, 288 KB)
Myriophyllum spicatum​

Longspine Sandbur
Cenchrus longispinus

Scentless chamomile (PDF, 139KB)  Tripleurospermum inodorum​

Sulphur cinquefoil  (PDF, 133KB)
Potentilla recta

Carpet burweed
Soliva sessilis

Gorse (PDF, 144KB)  
Ulex europaeus

Mountain bluet
Centaurea montana​

Scotch thistle (PDF, 152KB)  
Onopordum acanthium

Sweet fennel
Foeniculum vulgare​

Cypress spurge
Euphorbia cyparissias​

Invasive yellow hawkweeds
Hieracium spp.

Purple loosestrife (PDF, 140KB) 
Lythrum salicaria

Spurge laurel/Daphne 
Daphne laureola

Tansy ragwort (PDF, 140KB)
Jacobaea vulgaris

Invasive plants with biocontrol

The B.C. government uses biocontrol agents to reduce invasive plant populations to ecologically and economically acceptable levels, and to prevent invasive plants spreading into new areas.