By 1916 there were 12 Weeds in British Columbia.
By 2013 there are still five from the original list.
2013 hit list of worst weeds: 39
Is there a database that links weeds to their country of origin to Canadian soils, by date of introduction? eg. Scotland's Thistle 1249.
Control measures include Trichosirocalus weevils, but a problem with this approach, at least in North America, is that the introduced weevils may affect native thistles at least as much as the desired targets.Hawaii 106 listing of the most invasive horticultural plants
British Columbia:
1916 Link Updated 2023-02-05
1916
The following are the weeds classified as noxious under the "Noxious Weeds Act" (chapter, and verse, 66, 1915) of the Province of British Columbia : -
Annual sow-thistle native to Asia and Europe
Ball mustard
Blue burr or stickseed
Canada Thistle native throughout Europe and northern Asia
Dodder native to Europe
Ox-eye daisy
Perennial sow-thistle native to Caucasus, Asia Minor, Afghanistan, West Siberia
Ragweed
Stinkwood
Tumbling mustard
Wild mustard and charlock
Wild oats native to Scotland
2013
The following weeds are classified as noxious within all regions of British Columbia:
Annual Sowthistle (Sonchus oleraceus)
Bohemian Knotweed (Fallopia x bohemica)
Bur Chervil (Anthriscus caucalis)
Canada Thistle (Cirsium arvense)
Common Reed (Phragmites australis subsp. australis)
Crupina (Crupina vulgaris)
Common Toadflax (Linaria vulgaris)
Dalmatian Toadflax (Linaria dalmatica)
Dense-flowered Cordgrass (Spartina densiflora)
Diffuse Knapweed (Centaurea diffusa)
Dodder (Cuscuta spp.)
English Cordgrass (Spartina anglica)
Flowering Rush (Butomus umbellatus)
Garlic Mustard (Alliaria petiolata)
Giant Hogweed (Heracleum mantegazzianum)
Giant Knotweed (Fallopia sachalinensis)
Giant Mannagrass / Reed Sweetgrass (Glyceria maxima)
Gorse (Ulex europaeus)
Himilayan Knotweed (Polygonum polystachyum)
Hound's-tongue (Cynoglossum officinale)
Japanese Knotweed (Fallopia japonica)
Jointed Goatgrass (Aegilops cylindrica)
Leafy Spurge (Euphorbia esula)
Milk Thistle (Silybum marianum)
North Africa Grass (Ventenata dubia)
Perennial Sowthistle (Sonchus arvensis)
Purple Loosestrife (Lythrum salicaria)
Purple Nutsedge (Cyperus rotundus)
Rush Skeletonweed (Chondrilla juncea)
Saltmeadow Cordgrass (Spartina patens)
Scentless Chamomile (Matricaria maritima)
Smooth Cordgrass (Spartina alterniflora)
Spotted Knapweed (Centaurea maculosa)
Tansy Ragwort (Senecio jacobaea)
Velvetleaf (Abutilon theophrasti)
Wild Oats (Avena fatua)
Yellow Flag Iris (Iris pseudacorus)
Yellow Nutsedge (Cyperus esculentus)
Yellow Starthistle (Centaurea solstitialis)
There are weeds classified as noxious within the boundaries of corresponding regional districts:
Weeds are responsible for reductions in crop yield and quality and they lead to environmental degradation through destruction of native plant and animal habitat. Weeds also harbour insects and diseases of crops, create unsafe conditions, reduce property values and the aesthetics of an enjoyable landscape and many can poison humans, livestock and wildlife. Weed-Guide
Blueweed
Burdock
Cleavers
Common Bugloss
Common Tansy
Field Scabious
Green Foxtail
Hoary Alyssum
Hoary Cress
Kochia
Marsh Plume Thistle
Meadow Knapweed
Night-Flowering Catchfly
Orange Hawkweed
Oxeye Daisy
Perennial Pepperweed
Plumeless Thistle
Puncturevine
Purple Loosestrife
Quackgrass
Russian Knapweed
Russian Thistle
Scotch Thistle
Sulphur Cinquefoil
Tartary Buckwheat
White Cockle
Wild Chervil
Wild Mustard
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