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