Weeds: Shepherd’s purse Categories: Broadleaf Sh-Z Weeds Last review date: 2026-10-10 10:06 Last edit date: 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 […]
Weeds: Shiny geranium Categories: Broadleaf Sh-Z Weeds Last review date: 2026-10-07 11:32 Last edit date: Scientific name: Geranium lucidum Family: Geraniaceae Cycle: Annual/Biennial Plant type: Broadleaf Other Common Names: Shining crane’s bill Shiny geranium flower close up Photo by: Bruce Newhouse, Bugwood.org Biology Shiny geranium is an annual that sometimes grows as a biennial. It […]
Weeds: Smartweeds Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:20 Last edit date: 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, […]
Weeds: Sowthistle, annual and perennial Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:27 Last edit date: 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 […]
Weeds: Tree of Heaven Categories: Broadleaf Class C High Alert Invasive Pests High Alert Invasive Plants Noxious Weeds Sh-Z Weeds Last review date: 2026-10-13 07:56 Last edit date: 2026-10-13 Scientific name: Ailanthus altissima Family: Simaroubaceae Cycle: Perennial Plant type: Broadleaf, woody, deciduous Other Common Names: Ailanthus tree, Tree-of-heaven Tree of Heaven is highly adaptable to […]
Weeds: Speedwells Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:33 Last edit date: 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 […]
Weeds: Spurges Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:37 Last edit date: 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 […]
Weeds: Stinging nettle Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:39 Last edit date: 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 […]
Weeds: St. Johnswort, common Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 12:41 Last edit date: 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 […]
Weeds: Tansy ragwort Categories: Broadleaf Sh-Z Weeds Last review date: 2026-07-28 01:05 Last edit date: 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. […]
