The issue: Mayweed chamomile
The issue: Common tansy (Tanacetum vulgare), a creeping, spreading perennial from Eurasia, was introduced to the U.S. as an ornamental plant and for medicinal purposes.
The issue: Yellow Toadflax
The issue: Purple loosestrife
The issue: Water hemlock
The issue: Oxeye daisy
The issue: Dalmatian toadflaxes
The issue: Dyer’s woad (Isatis tinctoria) is a biennial from central Asian and Russia. Historically, it was used to produce a rich blue dye and was introduced to North America in the late 1600s for the same purpose. The plant has successfully invaded rangeland, pastures, cultivated fields an…
The issue: Poison Hemlock
The issue: Curlyleaf pondweed
The issue: Yellow starthistle
The issue: Common crupina
The issue: Buffalobur
The issue: Black henbane
The issue: Cutleaf vipergrass
The issue: Plumeless thistle
The issue: Perennial sowthistle
The issue: Rush skeletonweed
The issue: Hairy Nightshade
The issue: Lambsquarters
The issue: White clover
The issue: Purslane
The issue: Curlycup Gumweed
The issue: Redroot pigweed
The issue: Summer is when weeds are most noticeable, mostly because they are large and that is the time we are out in our yards and fields. Annuals and seedlings are easy to kill. Biennials are usually going to seed during the summer months. Perennials are quite difficult to kill in the summer.
The issue: Wild buckwheat
The issue: Spotted spurge
The issue: Common mallow or cheese weed (Malva neglecta) is a non-native weed that will germinate from spring through fall. Fall-germinated seedlings will overwinter and continue growth during the next spring. While it is an all-season annual, it may behave more like a biennial or even a sho…
The issue: Black medic
The issue: Prostrate knotweed
The issue: Pineapple weed
The issue: Puncturevine
The issue: Leafy spurge
The issue: Western salsify
The issue: Houndstongue
The issue: Common yarrow
The issue: Field bindweed (morningglory)
The issue: Hoary cress (whitetop)
The issue: Canada thistle
The issue: Bur buttercup
The issue: Crabgrass
The issue: Spring weed control
The issue: Annual bluegrass
The issue: Quackgrass
The issue: Scotch thistle (Onopordum acanthium L.), is a non-native plant from Eurasia. This biennial, which can reach 12 feet, forms a rosette with large leaves and a deep taproot the first season. The leaves and stems are gray-green in color. Scotch thistle has very prominent stem “fins” a…
The issue: White Bryony
The issue: Russian Knapweed
Winter Weed Control: Bittersweet nightshade
The issue: Diffuse Knapweed
Winter Weed Control: Virginia Creeper
Winter Weed Control: Russian olive
Winter Weed Control: Siberian elm
Winter Weed Control: Woody plant control—basal bark treatment
Winter Weed Control: Woody plant control—Cut-stump
Fall Weed Control: Prickly lettuce — all-season annual or biennial