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The following is a collective list of Allergenic plants, by zone, with supporting information. Click on the map above or on a link below to view plants specific to that zone.

Plant Name  
Abelmoschus esculentus (Okra) More Info
Abies procera (Noble fir) More Info
Acer platanoides (Norway maple) More Info
Aglaonema (Chinese evergreen) More Info
Agrostis capillaris (Colonial bentgrass) More Info
Agrostis gigantea (Black bentgrass) More Info
Agrostis stolonifera (Redtop, creeping bentgrass) More Info
Ailanthus altissima (Tree-of-heaven) More Info
Alcea rosea (Hollyhock) More Info
Allium (Onion, garlic, leek, shallot) More Info
Alnus rhombifolia (White alder) More Info
Alopecurus pratensis (Field meadow foxtail) More Info
Amaranthus (Pigweeds, tumbleweeds, waterhemp) More Info
Amaranthus albus (Tumbleweed) More Info
Amaranthus blitoides (Mat amaranth) More Info
Amaranthus retroflexus (Pigweed, Redroot/Rough amaranth) More Info
Amaranthus rudis (Tall amaranth, western waterhemp) More Info
Ambrosia artemisiifolia (Annual ragweed,common ragweed, short ragweed) More Info
Ambrosia chamissonis (Silver burr ragweed) More Info
Ambrosia psilostachya (Perennial ragweed, Western ragweed ) More Info
Anthoxanthum odoratum (Large sweet vernalgrass) More Info
Anthurium (Flamingo flower, anthurium) More Info
Apium graveolens (Celery) More Info
Arrhenatherum elatius (Tall oatgrass) More Info
Artemisia campestris (Sagewort, wormwood) More Info
Artemisia ludoviciana (White sage) More Info
Artemisia pycnocephala (Sanddune sagebrush) More Info
Artemisia vulgaris (Mugwort, Common Wormwood) More Info
Atriplex canescens (Wingscale, Four wing saltbush) More Info
Atriplex patula (Halberd leaf orache, Common Orache) More Info
Atriplex rosea (Red scale, Tumbling orache) More Info
Atriplex watsonii (Coast saltbush) More Info
Atropa belladonna (Belladonna) More Info
Avena fatua (Wild oat, Common Oat ) More Info
Avena sativa (Cultivated oat) More Info
Bassia scoparia (Burning bush, firebush) More Info
Begonia spp, (Begonias) More Info
Brassica (Mustard, Cabbage (inc. brocolli, Brussels sprouts, cauliflower), Rape) More Info
Brassica campestris (rapa) (Mustard) More Info
Bromus (Brome grasses) More Info
Bromus inermis (Smooth brome) More Info
Bromus secalinus (Rye brome, Cheat brome) More Info
Buxus sempervirens (Boxwood) More Info
Caladium bicolor (Caladium) More Info
Campanula (Canterbury bells, campanula, bluebells, harebells) More Info
Cannabis sativa (Western water hemp) More Info
Capsicum (Red peppers, Chili peppers, Hot peppers) More Info
Carex (Sedges) More Info
Cedrus deodara (Deodar cedar) More Info
Celtis laevigata (Sugarberry, Hackberry) More Info
Centaurea maculosa (Knapweed) More Info
Chamaecyparis lawsoniana (Port Orford cedar, Lawson's cypress) More Info
Chamaecyparis nootkatensis (Alaska cedar) More Info
Chamaecyparis obtusa (Hinoki white cypress) More Info
Chamaedorea (Parlor palm, Bamboo palm, Reed palm) More Info
Chamaenerion angustifolium (Fireweed) More Info
Chenopodium album (Lamb's quarters) More Info
Chenopodium berlandieri (Pit seed goosefoot) More Info
Chrysanthemum (Chrysanthemum, Crown daisy, Corn marigold) More Info
Chrysanthemum leucanthemum (Daisy, Ox-Eye) More Info
Chrysanthemum x morifolium (Florist's chrysanthemum) More Info
Cichorium intybus (Chicory) More Info
Cleome spinosa (Spider flower) More Info
Codiaeum variegatum (Croton) More Info
Corylus americana (American hazelnut) More Info
Cymbidium (Cymbidium orchids) More Info
Cynodon dactylon (Bermudagrass) More Info
Cyperus (Sedges, papyrus) More Info
Cyperus esculentus (Yellow nut sedge, chufa) More Info
Delphinium (Larkspur, Staggerweed) More Info
Dianthus caryophyllus (Carnation) More Info
Dieffenbachia spp. and hybrids (Dumb-cane) More Info
Digitaria (Crabgrass) More Info
Distichlis spicata (Coastal saltgrass) More Info
Elymus repens (Quack grass, Couch grass) More Info
Epipremnum aureum (Pothos) More Info
Euphorbia (Spurges, Milk cacti) More Info
Euphorbia cyathophora (Painted leaf) More Info
Euphorbia fulgens (Scarlet plume) More Info
Euphorbia heterophylla (Painted leaf) More Info
Euphorbia pulcherrima (Poinsettia) More Info
Festuca elatior (Meadow Fescue) More Info
Festuca rubra (Red fescue) More Info
Ficus benjamina (Weeping banyan, Weeping fig) More Info
Foeniculum vulgare (Fennel) More Info
Fraxinus latifolia (Oregon ash) More Info
Ginkgo biloba (Maidenhair tree) More Info
Gypsophila paniculata (Baby's breath) More Info
Hedera helix (English ivy) More Info
Helenium autumnale (Sneezeweed) More Info
Helianthus annuus (Common Sunflower) More Info
Hippeastrum spp. and hybrids (Amaryllis) More Info
Hordeum vulgare (Common Barley) More Info
Hyacinthus orientalis (Hyacinth) More Info
Hydrangea macrophylla (Hydrangea) More Info
Iris (Flag, Iris) More Info
Iva axillaris (Poverty Weed, Deer root) More Info
Juglans regia (English walnut) More Info
Juniperus (Junipers, Red cedars) More Info
Juniperus chinensis (Pfitzer (Juniper, Chinese)) More Info
Juniperus communis (Common Juniper) More Info
Koeleria macrantha (Hairgrass) More Info
Lactuca sativa (Lettuce) More Info
Lactuca scariola (Prickly lettuce) More Info
Leymus cinereus (Giant wild ryegrass, ) More Info
Lolium perenne (Perennial ryegrass) More Info
Lolium pratense (Meadow grass) More Info
Medicago sativa (Alfalfa, lucerne) More Info
Melilotus officinalis (Yellow sweet clover) More Info
Mentha (Mint, Peppermint, Spearmint, Pennyroyal, Horsemint) More Info
Monstera deliciosa (Ceriman) More Info
Morus alba (White mulberry) More Info
Morus rubra (Red mulberry) More Info
Nicotiana (Tobacco) More Info
Opuntia (Beavertail cactus, Tuna, Cholla, Prickly pear cactus) More Info
Pascopyrum smithii (Western wheatgrass) More Info
Pastinaca sativum (Wild parsnip) More Info
Petroselinum crispum (Parsley) More Info
Phacelia (Scorpion weeds) More Info
Phalaris arundinacea (Reed Canarygrass ) More Info
Phalaris canariensis (Common Canarygrass) More Info
Philodendron (Philodendron) More Info
Philodendron scandens (Heartleaf philodendron) More Info
Phleum pratense (Common Timothy) More Info
Phragmites australis (Common Reed) More Info
Picea sitchensis (Sitka spruce) More Info
Pinus (Pine trees) More Info
Pinus contorta (Lodgepole pine) More Info
Pinus monticola (Western white pine) More Info
Pinus radiata (Monterey pine) More Info
Plantago lanceolata (English plantain) More Info
Plantago major (Common plantain) More Info
Poa compressa (Flat-stem bluegrass) More Info
Poa pratensis (Kentucky bluegrass, June grass) More Info
Poa secunda (Sandberg's bluegrass) More Info
Polygonum (Knotweeds, Smartweeds) More Info
Polyscias (Ming aralias) More Info
Populus tremuloides (Quaking aspen) More Info
Primula malacoides (Fairy primrose) More Info
Primula obconica (Primrose) More Info
Prunus cerasus (Sour cherry) More Info
Pteridum aquilinum (Bracken fern) More Info
Pyrus communis (Common Pear) More Info
Quercus agrifolia (Coastal live oak) More Info
Ranunculus (Buttercups, Crowfoots) More Info
Raphanus sativus (Radish) More Info
Rhoeo spathacea (Oyster plant, Moses-in-a-cradle) More Info
Rosmarinus officinalis (Rosemary) More Info
Rumex acetosella (Red sorrel, Common Sheep sorrel) More Info
Rumex crispus (Curly dock) More Info
Rumex obtusifolius (Bitter dock) More Info
Salicornia virginica (Pickleweed) More Info
Salix (Willows) More Info
Salix caprea (Sallow, Goat willow) More Info
Salix caroliniana (Coastal plain willow) More Info
Salix lasiolepis (Arroyo willow) More Info
Salix lucida (Yellow willow) More Info
Salix nigra (Black willow) More Info
Sambucus nigra (Elderberry) More Info
Schefflera actinophylla (Umbrella tree) More Info
Scirpus (Bulrushes) More Info
Secale cereale (Cultivated Rye) More Info
Sequoia sempervirens (Redwood) More Info
Solidago canadensis (Canadian goldenrod) More Info
Solidago gigantea (Late goldenrod) More Info
Sorghum bicolor (Sorghum, Sudan grass (subsp, drummondii]) More Info
Spinacia oleracea (Spinach) More Info
Sporobolus cryptandrus (Sand dropseed) More Info
Streptocarpus (Cape primroses) More Info
Suaeda californica (California Seablite, Broom seepweed) More Info
Syngonium podophyllum (Nephthytis) More Info
Tagetes patula (French marigold) More Info
Taraxacum officinale (Common Dandelion) More Info
Thuja plicata (Western cedar, Western arborvitae) More Info
Thymus vulgaris (Thyme) More Info
Tradecantia pallida (Purple queen, Purple heart) More Info
Trifolium pratense (Red clover) More Info
Trifolium repens (White clover) More Info
Triticum aestivum (Cultivated bread wheat) More Info
Tropaeolum majus (Nasturtium) More Info
Tsuga heterophylla (Western hemlock) More Info
Tsuga mertensiana (Mountain hemlock) More Info
Tulipa (Tulips) More Info
Ulmus pumila (Siberian elm) More Info
Urtica dioica (Stinging nettle) More Info
Vinca (Periwinkle) More Info
Xanthium strumarium (Cockleburs) More Info
Zantedeschia (Calla lilies) More Info
Zea mays (Corn, Maize) More Info
 

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