Weeds: Annual bluegrass – Poa annua Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:10 Family: Poaceae (Graminae) Cycle: Annual/Perennial Plant type: Grass Annual bluegrass Photo by: T. Miller Biology Annual bluegrass leaves are folded in the bud and have a distinct midvein. The leaves are about 1⁄8 inch wide and cupped at the tip […]
Weeds: Barnyardgrass – Echinochloa crus-galli Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:11 Family: Poaceae (Graminae) Cycle: Summer annual Plant type: Grass Barnyardgrass Photo by: J.A. Kropf Biology Barnyardgrass grows in clumps up to five feet tall. Leaf blades are smooth, flat, and broad (about 1⁄2 inch or more) with a pointed tip. The […]
Weeds: Bentgrass, creeping – Agrostis stolonifera Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:12 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Creeping bentgrass Photo by: B.M. Johnson Biology Creeping bentgrass is a low-growing, perennial grass. Unmowed plants can reach 8 to 20 inches in height. The leafy stolons lie along the ground, rooting […]
Weeds: Bermudagrass – Cynodon dactylon Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:14 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Bermudagrass blades Photo by: D.G. Swan Biology Bermudagrass is a warm-season perennial grass that typically is prostrate and spreads to form dense patches. Spread occurs by both rhizomes and aboveground stems which root […]
Weeds: Crabgrass – Digitaria spp. Categories: C-E Grasses Weeds Last review date: 2026-06-05 08:16 Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Crabgrass Photo by: R. Parker 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 […]
Weeds: Downy brome (Cheatgrass, Downy chess) – Bromus tectorum Categories: C-E Grasses Weeds Last review date: 2026-06-05 08:17 Family: Poaceae (Graminae) Cycle: Winter annual Plant type: Grass Downy brome – cheatgrass Photo by: J.A. Kropf Biology Downy brome is a winter annual (sometimes a summer annual) reproducing by seed. Germination typically occurs during late summer […]
Weeds: Foxtail (Green, Yellow, Bristly) – Setaria spp. Categories: F-H Grasses Weeds Last review date: 2026-06-05 08:19 Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Yellow foxtail Photo 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). […]
Weeds: Quackgrass – Elymus repens (Elytrigia repens, Agropyron repens) Categories: Grasses Pr-Sc Weeds Last review date: 2026-06-05 08:26 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Quackgrass Photo by: D.G. Swan Biology Quackgrass is a perennial grass which spreads by both seeds and rhizomes, forming dense clumps if left unchecked. The spreading rhizomes are typically […]
Weeds: Reed canarygrass – Phalaris arundinacea Categories: Grasses Pr-Sc Weeds Last review date: 2026-06-05 08:27 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Reed canarygrass emerging in spring Photo by: B.M. Johnson Biology An aggressive plant, reed canarygrass grows from a large root system. It spreads rapidly by seeds and rhizomes to form large, dense […]
Weeds: Ryegrass, annual (Italian ryegrass) – Lolium perenne ssp. multiflorum Categories: Grasses Pr-Sc Weeds Last review date: 2026-06-05 08:27 Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Ryegrass spikelets Photo by: T.W. Miller Biology Annual ryegrass is upright, growing in clumps often reaching four feet tall. The flat leaf blades are shiny and about 1/8 […]
