Weeds: Field bindweed (Wild morningglory) – Convolvulus arvensis categories: F-H Weeds last review date: 2025-09-15 10:32 Family: Convolvulaceae Cycle: Perennial Plant type: Broadleaf Field bindweed flowers and leavesPhoto by: D.G. Swan Biology Field bindweed is a prostrate or twining weed which spreads by seed and by new plants arising from a perennial root system reaching […]
Weeds: Field pennycress (Fanweed) – Thlaspi arvense categories: F-H Weeds last review date: 2025-09-15 01:25 Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Field pennycress fruitsPhoto by: D.G. Swan Biology Field pennycress grows six to eighteen inches tall, branching mainly in the upper, flowering portion of the plant. The leaves are elongate, hairless, and alternate, […]
Weeds: Flixweed – Descurainia sophia categories: F-H Weeds last review date: 2025-09-15 10:33 Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Flixweed stem and flower headPhoto by: J.A. Kropf Biology Seedling flixweed plants consist of a low-growing rosette of finely divided, fern-like leaves from a taproot. Mature plants are upright, reaching one to three feet […]
Weeds: Foxtail (Green, Yellow, Bristly) – Setaria spp. categories: F-H Weeds last review date: 2025-09-15 01:29 Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Yellow foxtailPhoto by: D.G. Swan Biology Three species of foxtails are found in the Pacific Northwest: green foxtail (S. viridis), yellow foxtail (Setaria pumila), and bristly foxtail (S. verticillata). Yellow foxtail […]
Weeds: Garden loosestrife – Lysimachia vulgaris categories: F-H Weeds last review date: 2025-09-15 01:34 Family: Primulaceae Cycle: Perennial Plant type: Broadleaf Garden loosestrife, floweringPhoto by: King County Noxious Weed Control Program Biology Garden loosestrife is an erect rhizomatous perennial that may attain a height of three feet or more. Both stems and leaves are soft […]
Weeds: Giant hogweed – Heracleum mantegazzianum categories: F-H Weeds last review date: 2025-09-15 01:40 Family: Apiaceae (Umbelliferae) Cycle: Perennial Plant type: Broadleaf Giant hogweedPhoto by: Washington Noxious Weed Control Board Biology Giant hogweed is a short-lived perennial plant, typically surviving 2 to 5 years. The hollow stems are robust (two- to four-inch diameter), hairy, ribbed, […]
Weeds: Goldenrods – Solidago spp. categories: F-H Weeds last review date: 2025-09-15 01:43 Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Goldenrod with flowersPhoto by: T.W. Miller Biology Most goldenrod species spread by both seeds and by creeping root systems. They are upright plants, growing one to four feet tall or more, depending on species. […]
Weeds: Ground ivy – Glechoma hederacea categories: F-H Weeds last review date: 2025-09-15 01:48 Family: Lamiaceae Cycle: Perennial Plant type: Broadleaf Ground IvyPhoto by: Mike Dickison 4.0/deed.en Biology Ground ivy is an aromatic evergreen creeper of the mint family. The leaf produces an aroma when crushed. It may become weedy and invasive in some regions […]
Weeds: Groundsel, common – Senecio vulgaris categories: F-H Weeds last review date: 2025-09-15 01:56 Family: Asteraceae (Compositae) Cycle: Annual/Biennial Plant type: Broadleaf Common groundsel with seed headsPhoto by: R. Parker Biology Common groundsel may reach four to eighteen inches tall. Seedlings are small rosettes of deeply notched or lobed leaves one to four inches long […]
Weeds: Hawkweeds – Hieracium spp. categories: F-H Weeds last review date: 2025-09-15 02:01 Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Orange hawkweed flowerheadsPhoto by: T.W. Miller Biology Hawkweeds are fibrous rooted perennial herbs that grow up to a foot tall. The leaves are basal, with an occasional leaf or two on stems. The bristly, […]
