Weeds: Shepherd’s-purse Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:18 Scientific name: Capsella bursa-pastoris Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Other Common Names: Lady’s purse Shepherd’s-purse flowers and fruits Photo by: T.W. Miller Biology Shepherd’s-purse is an annual or winter annual (sometimes a biennial) plant with a thin taproot. The leaves are […]
Weeds: Smartweeds Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:20 Scientific name: Polygonum spp. Family: Polygonaceae Cycle: Annual/Perennial Plant type: Broadleaf Other Common Names: Knotweed, Knotgrass Smartweed leaves Photo by: J.A. Kropf Biology Smartweeds are typically annual weeds with erect or spreading stems up to 3 feet long. The leaves are alternate, attaching to the […]
Weeds: Sowthistle, annual and perennial Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:27 Scientific name: Sonchus oleraceus, Sonchus arvensis Family: Asteraceae (Compositae) Cycle: Annual Plant type: Broadleaf Other Common Names: Common sowthistle, Smooth sow thistle, Spiny sowthistle Annual sowthistle flower heads Photo by: T.W. Miller Biology Annual sowthistle grows upright and can reach from […]
Weeds: Speedwells Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:33 Scientific name: Veronica spp. Family: Scrophulariaceae Cycle: Annual/Perennial Plant type: Broadleaf Other Common Names: Ivy Leaf Speedwell Speedwell foliage and flowers close-up Photo by: P.R. Corpuz Biology Three of the speedwell species common in the Pacific Northwest are very similar in appearance. Ivyleaf speedwell […]
Weeds: Spurges Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:37 Scientific name: Euphorbia spp. (Chamaesyce spp.) Family: Euphorbiaceae Cycle: Annual Plant type: Broadleaf Other Common Names: Prostrate spurges, Spotted spurge, Petty spurge Prostrate spurge with flowers Photo by: D.G. Swan Biology There are four prostrate weedy spurges that are common in the western United […]
Weeds: Stinging nettle Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:39 Scientific name: Urtica dioica Family: Urticaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: Common nettle, Burn nettle, Nettle leaf Stinging nettle flowers Photo by: R. Parker Biology Stinging nettles are typically erect, slender plants reaching two to nine feet high. The opposite […]
Weeds: St. Johnswort, common Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:41 Scientific name: Hypericum perforatum Family: Clusiaceae (Guttiferae) Cycle: Perennial Plant type: Broadleaf Other Common Names: Goatweed, Klamathweed St. Johnswort in bloom Photo by: D.G. Swan Biology Common St. Johnswort is an erect shrubby plant one to three feet high arising from a […]
Weeds: Tansy ragwort Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 01:05 Scientific name: Senecio jacobaea Family: Asteraceae (Compositae) Cycle: Biennial Plant type: Broadleaf Other Common Names: Common ragwort, Stinking willie, Benweed, Cusha, Staggerwort Tansy ragwort Photo by: T.W. Miller Biology Tansy ragwort is a biennial or short-lived perennial spreading by seeds. In lawns, regular […]
Weeds: Tumblemustard Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 01:12 Scientific name: Sisymbrium altissimum Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Other Common Names: Jim Hill mustard, Tall hedge mustard, Tumbleweed mustard Tumblemustard in bloom image 1 Photo by: J.A. Kropf Biology Tumblemustard grows 2-5 feet tall. Seedling plants are low-growing rosettes of […]
Weeds: Velvetgrass Categories: Grasses Sh-Z Weeds Last review date: 2026-07-28 01:09 Scientific name: Holcus lanatus Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Other Common Names: Yorkshire fog, Tufted grass, Meadow soft grass, Common velvetgrass Velvetgrass flowering Photo by: T.W. Miller Biology Velvetgrass is a perennial reaching one to three feet high (if unmowed). Typically […]
