Weeds: Comfrey – Symphytum officinale categories: Weeds revision date: 2022-12-16 12:00 Comfrey bell-shaped flowersPhoto by: T.W. Miller Family: Boraginaceae Cycle: Perennial Plant type: Broadleaf Biology Comfrey has clump-forming perennial roots with brown to black bark. The roots are thick and penetrate deep in the soil, making comfrey difficult to eradicate once established. Plants are from […]
Weeds: Crabgrass – Digitaria spp. categories: Weeds revision date: 2022-12-16 12:00 CrabgrassPhoto by: R. Parker Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Biology Large crabgrass (Digitaria sanguinalis) may reach up to two feet tall but is often prostrate. Stems lying along the ground may root, forming mats. The flat leaf blades are relatively broad […]
Weeds: Creeping Jenny: Lysimachia nummularia categories: Weeds revision date: 2022-12-19 12:00 Creeping Jenny flowerPhoto by: H. Zell Family: Primulaceae Cycle: Perennial Plant type: Evergreen Biology Lysimachia nummularia, commonly called moneywort or creeping Jenny, is a low-growing, creeping ground cover which forms a leafy mat only 2-4″ tall. Roots where leaf nodes come in contact with […]
Weeds: Dandelion – Taraxacum officinale categories: Weeds revision date: 2022-12-16 12:00 Common dandelion with flowersPhoto by: J.A. Kropf Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology The common dandelion is a persistent taprooted plant reproducing by seeds and by short shoots from the crown. It also grows back from roots broken during hand removal. […]
Weeds: Dock (Curly, Broadleaf) – Rumex spp. categories: Weeds revision date: 2022-12-15 12:00 Broadleaf dockPhoto by: T.W. Miller Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Biology Curly dock (Rumex crispus), also called sour dock or yellow dock, is a robust tap-rooted perennial growing two to five feet tall. Stems are erect, reddish, and slightly ridged. […]
Weeds: Dodder – Cuscuta spp. categories: Weeds revision date: 2022-12-15 12:00 Dodder entwining fuchsia stemPhoto by: R.S. Byther Family: Cuscutaceae Cycle: Annual Plant type: Parasitic Biology The parasitic flowering plant dodder (Cuscuta spp.) attacks living plants by entwining them in its slender stems. Dodder is characterized by its tangle of leafless, yellow to orange threadlike […]
Weeds: Downy brome (Cheatgrass, Downy chess) – Bromus tectorum categories: Weeds revision date: 2022-12-15 12:00 Downy brome – cheatgrassPhoto by: J.A. Kropf Family: Poaceae (Graminae) Cycle: Winter annual Plant type: Grass Biology Downy brome is a winter annual (sometimes a summer annual) reproducing by seed. Germination typically occurs during late summer or fall, with overwintering […]
Weeds: Dwarf mistletoes – Arceuthobium spp. categories: Weeds revision date: 2022-12-15 12:00 Dwarf mistletoe in coniferPhoto by: R.S. Byther Family: Loranthaceae Cycle: Perennial Plant type: Parasitic Biology Dwarf mistletoe is a parasitic plant that grows on the branches or occasionally on the trunk of a host tree. Mistletoe shoots range in color from yellowish to […]
Weeds: English daisy (Lawn daisy) – Bellis perennis categories: Weeds revision date: 2022-12-15 12:00 English daisy flowersPhoto by: J.A. Kropf Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology English daisy is a low-growing plant reproducing by seed. It may also spread from the crown to form clumps. The long-stalked leaves are broad at the […]
Weeds: English ivy – Hedera helix categories: Weeds revision date: 2022-12-15 12:00 English ivy leavesPhoto by: C.R. Foss Family: Cycle: Plant type: Biology English ivy is a low, dark green, fast-growing evergreen vine. It establishes roots at its nodes as it creeps along the ground, or aerial rootlets as it climbs trees and structures. It […]
Weeds: Field bindweed (Wild morningglory) – Convolvulus arvensis categories: Weeds revision date: 2022-12-15 12:00 Field bindweed flowers and leavesPhoto by: D.G. Swan Family: Convolvulaceae Cycle: Perennial Plant type: Broadleaf Biology Field bindweed is a prostrate or twining weed which spreads by seed and by new plants arising from a perennial root system reaching ten feet […]
Weeds: Field pennycress (Fanweed) – Thlaspi arvense categories: Weeds revision date: 2022-12-15 12:00 Field pennycress fruitsPhoto by: D.G. Swan Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf 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, with larger […]
Weeds: Flixweed – Descurainia sophia categories: Weeds revision date: 2022-12-15 12:00 Flixweed stem and flower headPhoto by: J.A. Kropf Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf 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 high. Fern-like […]
Weeds: Foxtail (Green, Yellow, Bristly) – Setaria spp. categories: Weeds revision date: 2022-12-16 12:00 Yellow foxtailPhoto by: D.G. Swan Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass 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 grows in […]
Weeds: Garden loosestrife – Lysimachia vulgaris categories: Weeds revision date: 2022-12-16 12:00 Garden loosestrife, floweringPhoto by: King County Noxious Weed Control Program Family: Primulaceae Cycle: Perennial Plant type: Broadleaf Biology Garden loosestrife is an erect rhizomatous perennial that may attain a height of three feet or more. Both stems and leaves are soft and hairy […]
Weeds: Giant hogweed – Heracleum mantegazzianum categories: Weeds revision date: 2022-12-16 12:00 Giant hogweedPhoto by: Washington Noxious Weed Control Board Family: Apiaceae (Umbelliferae) Cycle: Perennial Plant type: Broadleaf 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, and blotched […]
Weeds: Goldenrods – Solidago spp. categories: Weeds revision date: 2022-12-18 12:00 Goldenrod with flowersPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf 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. The leaves […]
Weeds: Ground ivy – Glechoma hederacea categories: Weeds revision date: 2022-12-18 12:00 Ground IvyPhoto by: Mike Dickison 4.0/deed.en Family: Lamiaceae Cycle: Perennial Plant type: Broadleaf 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 or habitats. […]
Weeds: Groundsel, common – Senecio vulgaris categories: Weeds revision date: 2022-12-18 12:00 Common groundsel with seed headsPhoto by: R. Parker Family: Asteraceae (Compositae) Cycle: Annual/Biennial Plant type: Broadleaf 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 and 1/4 […]
Weeds: Hawkweeds – Hieracium spp. categories: Weeds revision date: 2022-12-18 12:00 Orange hawkweed flowerheadsPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf 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, leafless, flower […]
