There's been a lot in the news lately about Giant Hog Weed. We all know this isn't the only poisonous plant in Canada but it is its spread that has become alarming. Below is a list of Canadian Poisonous Plant including houseplants, wild plants and some common plants available for sale across the country. This list is determined by the Government of Canada and listed on their website. Here is the link: http://www.cbif.gc.ca/pls/pp/poison?p_x=px.
This list may not be all-inclusive. Should you want to read more about these plants, follow the link. I find it interesting to note that so many oak are poisonous as well as garlic and alfalfa to name a few.
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alder buckthorn (Rhamnus frangula)
alfalfa (Medicago sativa)
aloe - A. barbadensis (Aloe barbadensis)
alsike clover (Trifolium hybridum)
amaryllis (A. belledonna) (Amaryllis belladonna)
amaryllis (A. vittata) (Amaryllis vittata)
American elder (Sambucus canadensis)
American holly (Ilex opaca)
American mistletoe (Phoradendron flavescens)
angel's trumpet (Datura innoxia)
Astragalus (A. adsurgens) (Astragalus adsurgens)
Astragalus (A. lentiginosus) (Astragalus lentiginosus)
Australian umbrella tree (Brassaia actinophylla)
autumn crocus (Colchicum autumnale)
avocado (Persea americana)
bird rape (Brassica campestris)
black cherry (Prunus serotina)
black henbane (Hyoscyamus niger)
black locust (Robinia pseudoacacia)
black nightshade (Solanum nigrum)
black oak (Quercus velutina)
black walnut (Juglans nigra)
black-eyed Susan (Rudbeckia serotina)
blue cardinalflower (Lobelia siphilitica)
blue cohosh (Caulophyllum thalictroides)
blue flag iris (Iris versicolor)
blueweed (Echium vulgare)
bog-laurel (Kalmia polifolia)
bracken (Pteridium aquilinum)
broad bean (Vicia faba)
broom snakeweed (Gutierrezia sarothrae)
buckwheat (Fagopyrum esculentum)
bulbous buttercup (Ranunculus bulbosus)
bur buttercup (Ceratocephalus testiculatus)
Burke's lupine (Lupinus burkei)
burningbush (Euonymus atropurpureus)
caladium (Caladium bicolor)
California bluebell (Phacelia campanularia)
California rose-bay (Rhododendron macrophyllum)
Canada nettle (Laportea canadensis)
Canada yew (Taxus canadensis)
Canadian milk-vetch (Astragalus canadensis)
candalabra aloe (Aloe arborescens)
candelabra-cactus (Euphorbia lactea)
caper spurge (Euphorbia lathyris)
cardinalflower (Lobelia cardinalis)
castor-bean (Ricinus communis)
celery-leaved buttercup (Ranunculus sceleratus)
Chinese-lantern (Physalis alkekengi)
chives (Allium schoenoprasum)
chrysanthemum (Chrysanthemum indicum)
climbing nightshade (Solanum dulcamara)
cocklebur (Xanthium strumarium)
Colorado rubberweed (Hymenoxys richardsonii)
common comfrey (Symphytum officinale)
common groundsel (Senecio vulgaris)
common hop (Humulus lupulus)
common milkweed (Asclepias syriaca)
common privet (Ligustrum vulgare)
common vetch (Vicia sativa)
corn poppy (Papaver rhoeas)
croton (Codiaeum variegatum)
crown-of-thorns (Euphorbia milii)
cut-leaved coneflower (Rudbeckia laciniata)
cyclamen (Cyclamen persicum)
cypress spurge (Euphorbia cyparissias)
daffodil (Narcissus pseudonarcissus)
death camas (Zigadenus venenosus)
Devil's-backbone (Kalanchoe daigremontiana)
dumbcane (Dieffenbachia bausei)
Dutchman's-breeches (Dicentra cucullaria)
eastern whorled milkweed (Asclepias verticillata)
English bluebell (Hyacinthoides nonscripta)
English holly (Ilex aquifolium)
English ivy (Hedera helix)
English yew (Taxus baccata)
entire-leaved groundsel (Senecio integerrimus)
European buckthorn (Rhamnus cathartica)
European elder (Sambucus nigra)
European spindletree (Euonymus europaeus)
false hellebore (Veratrum viride)
false ragweed (Iva xanthifolia)
February daphne (Daphne mezereum)
fiddleneck (Amsinckia intermedia)
field horsetail (Equisetum arvense)
five-hooked bassia (Bassia hyssopifolia)
flamingo lily (Anthurium andraeanum)
fly honeysuckle (Lonicera xylosteum)
foxglove (Digitalis purpurea)
garden-sorrel (Rumex acetosa)
garland daphne (Daphne cneorum)
garlic (Allium sativum)
gas plant (Dictamnus albus)
giant dumbcane (Dieffenbachia amoena)
giant hogweed (Heracleum mantegazzianum)
glory lily (Gloriosa superba)
golden-bean (Thermopsis rhombifolia)
golden-chain (Laburnum anagyroides)
golden-trumpet (Allamanda cathartica)
grass pea (Lathyrus sativus)
greasewood (Sarcobatus vermiculatus)
greater celandine (Chelidonium majus)
green tansy mustard (Descurainia pinnata)
ground-cherry (Physalis peruviana)
ground-ivy (Glechoma hederacea)
Guelder-rose (Viburnum opulus)
hairy vetch (Vicia villosa)
heart-leaved philodendron (Philodendron scandens)
hemp dogbane (Apocynum cannabinum)
horse-chestnut (Aesculus hippocastanum)
horseradish (Armoracia rusticana)
hound's tongue (Cynoglossum officinale)
hydrangea (Hydrangea macrophylla)
Iceland poppy (Papaver nudicaule)
Indian mustard (Brassica juncea)
Indian-tobacco (Lobelia inflata)
Jack-in-the-pulpit (Arisaema triphyllum)
Japanese wisteria (Wisteria floribunda)
Japanese yew (Taxus cuspidata)
Jerusalem-cherry (Solanum pseudocapsicum)
jimsonweed (Datura stramonium)
Johnson grass (Sorghum halepense)
Kaffir lily (Clivia miniata)
Kentucky coffeetree (Gymnocladus dioicus)
kochia (Kochia scoparia)
lamb's-quarters (Chenopodium album)
large-leaved lupine (Lupinus polyphyllus)
leafy spurge (Euphorbia esula)
leatherwood (Dirca palustris)
lily-of-the-valley (Convallaria majalis)
locoweed (Oxytropis sericea) (Oxytropis sericea)
low larkspur (Delphinium bicolor)
maidenhair tree (Ginkgo biloba)
mango (Mangifera indica)
marijuana (Cannabis sativa)
marsh arrow-grass (Triglochin palustre)
marsh horsetail (Equisetum palustre)
May-apple (Podophyllum peltatum)
Menzies larkspur (Delphinium menziesii)
monk's hood (Aconitum napellus)
moonseed (Menispermum canadense)
morning glory (Ipomoea tricolor)
mother-in-law plant (Dieffenbachia seguine)
motherwort (Leonurus cardiaca)
naked-flowered sneezeweed (Helenium flexuosum)
narcissus (Narcissus poeticus)
northern water-hemlock (Cicuta virosa)
oats (Avena sativa)
Ohio buckeye (Aesculus glabra)
oleander (Nerium oleander)
onion (Allium cepa)
opium poppy (Papaver somniferum)
Oriental poppy (Papaver orientale)
Osage-orange (Maclura pomifera)
pawpaw (Asimina triloba)
penciltree (Euphorbia tirucalli)
Peruvian lily (Alstroemeria ligtu)
petty spurge (Euphorbia peplus)
philodendron (Philodendron cordatum)
pin cherry (Prunus pensylvanica)
pink lady's-slipper (Cypripedium acaule)
poinsettia (Euphorbia pulcherrima)
poison ivy (Rhus radicans)
poison suckleya (Suckleya suckleyana)
poison sumac (Rhus vernix)
poison-hemlock (Conium maculatum)
pokeweed (Phytolacca americana)
ponderosa pine (Pinus ponderosa)
potato (Solanum tuberosum)
precatory-pea (Abrus precatorius)
prickly comfrey (Symphytum asperum)
prickly lettuce (Lactuca scariola)
primula (Primula obconica)
prostrate pigweed (Amaranthus blitoides)
purple cockle (Agrostemma githago)
purple locoweed (Oxytropis lambertii)
radish (Raphanus sativus)
rapeseed (Brassica napus)
red chokecherry (Prunus virginiana)
red clover (Trifolium pratense)
red maple (Acer rubrum)
red oak (Quercus rubra)
redroot pigweed (Amaranthus retroflexus)
reed canarygrass (Phalaris arundinacea)
rhubarb (Rheum rhaponticum)
Russian knapweed (Centaurea repens)
Saskatoon (a serviceberry) (Amelanchier alnifolia)
scarlet pimpernel (Anagallis arvensis)
seaside arrow-grass (Triglochin maritima)
sensitive fern (Onoclea sensibilis)
sheep sorrel (Rumex acetosella)
sheep-laurel (Kalmia angustifolia)
showy lady's-slipper (Cypripedium reginae)
showy milkweed (Asclepias speciosa)
Siberian scilla (Scilla siberica)
silky lupine (Lupinus sericeus)
silvery lupine (Lupinus argenteus)
skunk cabbage (Symplocarpus foetidus)
small lupine (Lupinus pusillus)
smooth pigweed (Amaranthus hybridus)
sneezeweed (Helenium autumnale)
snowdrop (Galanthus nivalis)
Sorghum (Sorghum bicolor)
spatulate-leaved heliotrope (Heliotropium curassavicum)
spotted dumbcane (Dieffenbachia maculata)
spotted water-hemlock (Cicuta maculata)
spreading dogbane (Apocynum androsaemifolium)
spurge-laurel (Daphne laureola)
squirrel-corn (Dicentra canadensis)
St. John's-wort (Hypericum perforatum)
star-of-Bethlehem (Ornithogalum umbellatum)
stinging nettle (Urtica dioica)
stinking rabbitbrush (Chrysothamnus nauseosus)
stinkweed (Thlaspi arvense)
Sudan grass (Sorghum sudanense)
sun spurge (Euphorbia helioscopia)
sunflower (Helianthus annuus)
sweet pea (Lathyrus odoratus)
Swiss-cheese plant (Monstera deliciosa)
tall larkspur (Delphinium glaucum)
tall manna grass (Glyceria grandis)
tansy (Tanacetum vulgare)
tansy ragwort (Senecio jacobaea)
Tartarian honeysuckle (Lonicera tatarica)
thin-leaved snowberry (Symphoricarpos albus)
timber milk-vetch (Astragalus miser)
tobacco (Nicotiana tabacum)
tree-of-heaven (Ailanthus altissima)
tulip (Tulipa gesneriana)
two-grooved milk-vetch (Astragalus bisulcatus)
veined dock (Rumex venosus)
velvety goldenrod (Solidago mollis)
Virginia creeper (Parthenocissus quinquefolia)
western bleedingheart (Dicentra formosa)
western minniebush (Menziesia ferruginea)
western poison-oak (Rhus diversiloba)
western water-hemlock (Cicuta douglasii)
white camas (Zigadenus elegans)
white clover (Trifolium repens)
white oak (Quercus alba)
white rose-bay (Rhododendron albiflorum)
white snakeroot (Eupatorium rugosum)
white sweet-clover (Melilotus alba)
wild cabbage (Brassica oleracea)
wild calla (Calla palustris)
wild false indigo (Baptisia leucantha)
wild ginger (Asarum canadense)
wild indigo (Baptisia tinctoria)
wild mustard (Sinapis arvensis)
wild onion (Allium canadense)
wild parsnip (Pastinaca sativa)
wild radish (Raphanus raphanistrum)
wormseed mustard (Erysimum cheiranthoides)
yellow iris (Iris pseudacorus)
yellow lady's-slipper (Cypripedium calceolus)
yellow rocket (Barbarea vulgaris)
yellow sage (Lantana camara)
yellow star-thistle (Centaurea solstitialis)
yellow sweet-clover (Melilotus officinalis)
yellow toadflax (Linaria vulgaris)
