Weeds: Knapweeds Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:25 Scientific name: Centaurea spp. Family: Asteraceae (Compositae) Cycle: Biennial/perennial Plant type: Broadleaf Other Common Names: Yellow Knapweed, Spotted Knapweed, Meadow Knapweed, Diffuse Knapweed Spotted knapweed flowerheads Photo by: B.F. Roche Biology Knapweeds are short-lived perennials with stout taproots. They can have one or more […]
Weeds: Knotweeds Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:34 Scientific name: Polygonum spp. Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: Bohemian Knotweed, Giant Knotweed, Japanese Knotweed, Himalayan Knotweed Japanese knotweed leaves Photo by: J.A. Kropf Biology The giant knotweeds are aggressive plants that spread via long rhizomes and also by […]
Weeds: Kochia Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:39 Scientific name: Kochia scoparia Family: Chenopodiaceae Cycle: Annual Plant type: Broadleaf Other Common Names: Burning Bush, Mexican Fireweed, Summer Cypress Kochia showing fall color Photo by: J.A. Kropf Biology Kochia has a single stem reaching one to six feet high. The main stem is […]
Weeds: Lambsquarters, common Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:45 Scientific name: Chenopodium album Family: Chenopodiaceae Cycle: Annual Plant type: Broadleaf Other Common Names: Baconweed, Bacon Weed, Fat Hen, Frost-blite, Goosefoot, Lambsquarters, Pigweed, White Goosefoot Common lambsquarters Photo by: T.W. Miller Biology Common lambsquarters is typically an upright, branching plant growing one to […]
Weeds: Lesser celandine Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:50 Scientific name: Ficaria verna Family: Ranunculaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: Dusky Maiden, Fig Buttercup, Lesser Crowfoot, Pilewort Lesser celandine close-up Photo by: S. Campbell Biology Lesser celandine is a noxious weed. It is highly variable and has club-shaped, tuberous […]
Weeds: Liverworts Categories: Bryophyte (mosses & liverworts) I-Po Weeds Last review date: 2026-07-09 09:58 Scientific name: Several species Family: Various Cycle: Various Plant type: Bryophyte (mosses & liverworts) Liverworts in pot Photo by: J. Altland Biology Liverworts are low-growing, non-flowering relatives of mosses. They are typically small plants that grow prostrate on the ground. Lacking […]
Weeds: Mallow, common Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:02 Scientific name: Malva neglecta Family: Malvaceae Cycle: Various Plant type: Broadleaf Other Common Names: Buttonweed, Cheese Plant, Cheeseweed, Dwarf Mallow, Mallow Mallow flower Photo by: T.W. Miller Biology Common mallow can be an annual, winter annual, or biennial plant. The plants are spreading […]
Weeds: Nightshades Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:17 Scientific name: Solanum spp. Family: Solanaceae Cycle: Annual/Perennial Plant type: Broadleaf Other Common Names: Cut leaf nightshade, Black nightshade, Hairy nightshade Cutleaf nightshade with fruit Photo by: D.G. Swan Biology Nightshades are annual or perennial taprooted plants that spread by seeds. They usually have […]
Weeds: Oxalis Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:27 Scientific name: Oxalis corniculata Family: Oxalidaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: Creeping Woodsorrel, False Shamrock, Good Luck Plant, Shamrock, Sleeping Beauty, Sorrel, Sour Grass Woodsorrel leaves and flower Photo by: J.A. Kropf Biology Creeping woodsorrel is a prostrate plant, initially growing […]
Weeds: Parrotfeather and Eurasian watermilfoil Categories: Broadleaf aquatic I-Po Weeds Last review date: 2026-07-09 10:34 Scientific name: Myriophyllum spp. Family: Haloragaceae Cycle: Perennial Plant type: Broadleaf aquatic Other Common Names: Spike Watermilfoil, Brazilian Watermilfoil, Parrot Feather Milfoil, Red-Stemmed Parrot Feather Partotfeather fronds Photo by: T.W. Miller Biology These rhizomatous perennials exhibit an annual pattern of […]
