Weeds: Knapweeds Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:25 Last edit date: 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 […]
Weeds: Knotweeds Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:34 Last edit date: 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 […]
Weeds: Kochia Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:39 Last edit date: 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 […]
Weeds: Lambsquarters, common Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:45 Last edit date: 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 […]
Weeds: Lesser celandine Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 09:50 Last edit date: 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 […]
Weeds: Liverworts Categories: Bryophyte (mosses & liverworts) I-Po Weeds Last review date: 2026-07-09 09:58 Last edit date: 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 […]
Weeds: Mallow, common Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:02 Last edit date: 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 […]
Weeds: Nightshades Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:17 Last edit date: 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. […]
Weeds: Oxalis Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:27 Last edit date: 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 […]
Weeds: Parrotfeather and Eurasian watermilfoil Categories: Broadleaf aquatic I-Po Weeds Last review date: 2026-07-09 10:34 Last edit date: 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 […]
Weeds: Pineappleweed Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:40 Last edit date: Scientific name: Matricaria discoidea Family: Asteraceae (Compositae) Cycle: Annual Plant type: Broadleaf Other Common Names: Wild chamomile, Disc mayweed, Rayless mayweed Pineappleweed heads and leaves Photo by: T.W. Miller Biology Pineappleweed grows to over one foot in height, with leaves finely […]
Weeds: Plantain Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:44 Last edit date: Scientific name: Plantago spp. Family: Plantaginaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: Buckhorn Plantain, English plantain, Lanceleaf Plantain, Narrowleaf Plantain, Ribwort Plantain Broadleaf plantain Photo by: R. Parker Biology Broadleaf plantain leaves are all basal, forming a low-growing rosette. […]
Weeds: Poison hemlock Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:47 Last edit date: Scientific name: Conium maculatum Family: Apiaceae (Umbelliferae) Cycle: Biennial Plant type: Broadleaf Other Common Names: Deadly Hemlock, Poison Fool’s Parsley, Poison Parsley, Spotted Parsley Poison hemlock leaves Photo by: T.W. Miller Biology Seedling poison hemlock plants are rosettes of finely […]
Weeds: Poison ivy and Poison oak Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:51 Last edit date: Scientific name: Toxicodendron spp. (Rhus spp.) Family: Anacardiaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: Atlantic Poison Oak, Eastern Poison Oak, Eastern Poison Ivy Poison ivy leaves Photo by: J.A. Kropf Biology Western poison ivy (Toxicodendron […]
Weeds: Pokeweed Categories: Broadleaf I-Po Weeds Last review date: 2026-07-09 10:54 Last edit date: Scientific name: Phytolacca americana Family: Phytolaccaceae Cycle: Perennial Plant type: Broadleaf Other Common Names: American Pokeweed, Inkberry, Maritime Pokeweed, Pigeonberry, Poke, Pokeberry, Poke Salad Pokeweed plant Photo by: K. Volkov Biology Pokeweed is a shrub-like herbaceous perennial. It can grow quickly […]
