Reference · Weeds

Perennial sowthistle

270 items — choose below or search on the left.

270 items

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Cottonweed Achillea maritima Sneezewort yarrow Achillea ptarmica Russian knapweed Acroptilon repens Crofton weed Ageratina adenophora White snakeroot Ageratina altissima Mistflower Ageratina riparia Tropical whiteweed Ageratum conyzoides Bluemink Ageratum houstonianum Beach ageratum Ageratum littorale Common ragweed Ambrosia Annual sandbur (Ambrosia acanthicarpa) Ambrosia acanthicarpa Wingless ragweed Ambrosia aptera Southern ragweed Ambrosia bidentata Annual ragweed (Ambrosia confertiflora) Ambrosia confertiflora Gray's ragweed Ambrosia grayi Thinleaf ragweed Ambrosia tenuifolia Skeletonleaf burr ragweed Ambrosia tomentosa Giant ragweed Ambrosia trifida Anthemis Anthemis Stinking chamomile Anthemis cotula Capeweed Arctotheca calendula Creeping flatweed Arctotheca prostrata Atrichoseris platyphylla Atrichoseris platyphylla Eastern Baccharis Baccharis halimifolia Baccharoides anthelmintica Baccharoides anthelmintica Beggarticks Bidens cynapifolia Devil's beggartick Bidens frondosa Calycadenia truncata Calycadenia truncata Horseherb Calyptocarpus vialis Carline thistle Carlina vulgaris Cornflower Centaurea White cornflower Centaurea alba Dusty miller Centaurea cineraria Centaurea decipiens Centaurea decipiens Dichroanthous knapweed Centaurea dichroantha Diffuse knapweed Centaurea diffusa Centaurea diluta Centaurea diluta Gerstlaueri knapweed Centaurea gerstlaueri Hanry's knapweed Centaurea hanryi Brown knapweed Centaurea jacea Grayish knapweed Centaurea leucophaea Big-headed knapweed Centaurea macrocephala Black knapweed Centaurea nigra Tyrol knapweed Centaurea nigrescens Panicled knapweed Centaurea paniculata Phrygian knapweed Centaurea phrygia Rhaetian knapweed Centaurea rhaetica Rock knapweed Centaurea rupestris Salonika cornflower Centaurea salonitana Greater knapweed Centaurea scabiosa Spotted knapweed Centaurea stoebe Sulphur knapweed Centaurea sulphurea Thuillier's knapweed Centaurea thuillieri Centaurea trichocephala Centaurea trichocephala Single-flower cornflower Centaurea uniflora Squarrose knapweed Centaurea virgata Common Sneezeweed Centipeda cunninghamii Spreading sneezeweed Centipeda minima Fitch's tarweed Centromadia fitchii Parry's spikeweed Centromadia parryi

Weed plant reference

Catalogue of crop weeds: annual broadleaf, annual grass and perennial. For each — biology, harmfulness, infested crops and effective herbicides.

Weeds are linked to crops and protection products: a weed page shows which crops it infests and how to control it. Use the search on the left to find the object you need.