Alberta Certified Weed Free Hay Program

• To provide a premium product that is recognized as marketable and transportable
• To prevent the spread of weeds and undesirable plant species
• To protect private and public lands from invasive plant species
• To increase awareness of the environmental impact of non-native, invasive plant species

• Be a preferred product choice
• Bring a premium when sold
• Prevent weeds from spreading within the farm and between farms
• Prevent invasive species from becoming established in riparian and other environmentally sensitive areas

Absinth Wormwood Artemisia absinthium Leafy Spurge Euphorbia esula Autumn Olive Elaeagnus umbellata Lens Podded Hoary Cress Lepidium chalepense Baby's Breath Gypsophila paniculata Lesser Burdock Arctium minus Bermudagrass Cynodon dactylon Marsh Thistle Cirsium palustre Bighead Knapweed Centaurea macrocephala Matgrass Nardus stricta Black Henbane Hyoscyamus niger Meadow Hawkweed Hieracium caespitosum Black Knapweed Centaurea nigra Meadow Knapweed Centaurea x moncktonii Blueweed Echium vulgare Medusahead Taeniatherum caput-medusae Broad Leaved Pepper Grass Lepidium latifolium Milium Milium vernale Brown Knapweed Centaurea jacea Mouse Ear Hawkweed Hieracium pilosella Buffalobur Solanum rostratum Nodding Thistle Carduus nutans Canada Thistle Cirsium arvense Orange Hawkweed Hieracium aurantiacum Caraway Carum carvi Oxeye Daisy Leucanthemum vulgare Chinese Tamarisk Tamarix chinensis Pale Yellow Iris Iris pseudacorus Common Barberry Berberis vulgaris Perennial Sorghum Sorghum almum Common Buckthorn Rhamnus cathartica Perennial Sowthistle Sonchus arvensis Common Crupina Crupina vulgaris Plumeless Thistle Carduus acanthoides Common Mullein Verbascum thapsus Poison Hemlock Conium maculatum Common St. John's Wort Hypericum perforatum Puncturevine Tribulus terrestris Common Tansy Tanacetum vulgare Purple Loosestrife Lythrum salicaria Creeping Bellflower Campanula rapunculoides Quackgrass Agropyron repens Dalmatian Toadflax Linaria dalmatica Red Bartsia Odontites vernus Dame's Rocket Hesperis matronalis Rush Skeletonweed Chondrilla juncea Diffuse Knapweed Centaurea diffusa Russian Knapweed Rhaponticum repens Downy Brome Bromus tectorum Saltcedar Tamarix ramosissima Dyer's Woad Isatis tinctoria Saltlover Halogeton glomeratus Eurasian Water Milfoil Myriophyllum spicatum Scentless Chamomile Tripleurospermum inodorum Field Bindweed Convolvulus arvensis Scotch Thistle Onopordum acanthium Field Scabious Knautia arvensis Sericia Lespedeza Lespedeza cuneata Flowering Rush Butomus umbellatus Silverleaf Nightshade Solanum elaeagnifolium Garlic Mustard Alliaria petiolata Skeletonleaf Bursage Ambrosia tomentosa Giant Hogweed Heracleum mantegazzianum Smallflower Tamarisk Tamarix parviflora Giant Knotweed Fallopia sachalinensis Spotted Knapweed Centaurea stoebe Gobe Podded Hoary Cress Lepidium appelianum Squarrose Knapweed Centaurea virgata Greater Burdock Arctium lappa Sulphur Cinquefoil Potentilla recta Heart Podded Hoary Cress Lepidium draba Syrian Beancaper Zygophyllum fabago Hemp (marijuana) Cannabis sativa Tall Buttercup Ranunculus acris Himalayan Balsam Impatiens glandulifera Tansy Ragwort Jacobaea vulgaris Hoary Alyssum Berteroa incana Toothed Spurge Euphorbia dentata Horsenettle Solanum carolinense Tyrol knapweed Centaurea nigrescens Hound's Tongue Cynoglossum officinale White Cockle Silene latifolia Hybrid Japanese knotweed Fallopia x bohemica Wild Oats Avena fatua Hybrid Knapweed Centaurea x psammogena Wild Proso Millet Panicum miliaceum Japanese Brome Bromus japonicus Woolly Burdock Arctium tomentosum Japanese Knotweed Fallopia japonica Yellow Clematis Clematis tangutica Johnsongrass Sorghum halepense Yellow Nutsedge Cyperus esculentus Jointed Goatgrass Aegilops cylindrica Yellow Starthistle Centaurea solstitialis Yellow Toadflax Linaria vulgaris