Weed Identification and Control

Information on weed identification and control, including catsear, marestail, purple loosestrife, pokeweed, pigweed, poison ivy, crabgrass, hemlock, purslane and multiflora rose. Tips on various herbicides and integrated pest management.

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Photo: James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org
Yellow Woodsorrel - Articles Articles
Yellow woodsorrel (Oxalis stricta) has foliage (composed of three leaflets) that resembles white clover or black medic. More
Consider including violets in landscapes, or just leaving them where they are doing well. Photo: Kathleen Salisbury
Underused Native Plants: Common Blue Violets - Articles Articles
Native plants have become very popular over the years. More
Photo: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org, wild garlic,Allium vineale
Wild Onion and Wild Garlic - Articles Articles
Wild garlic (Allium vineale) and onion (Allium canadense) are perennial plants that can be a weed in turfgrass and landscape beds. More
Pineapple-weed (Matricaria discoidea) Photo: John D. Byrd, Mississippi State University, Bugwood.org
Pineappleweed - Articles Articles

Pineappleweed

Tim Abbey

Pineappleweed can be either a summer or winter annual. More
Photo: Shepherd's-purse Capsella bursa-pastoris Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Shepherd's purse - Articles Articles

Shepherd's purse

Tim Abbey

Shepherd's purse (Capsella bursa-pastoris) is a winter annual. More
Smooth groundcherry Physalis longifolia var. subglabrata Photo: Theodore Webster, USDA Agricultural Research Service, Bugwood.org
Smooth Groundcherry - Articles Articles
Smooth groundcherry (Physalis longifolia var. subglabrata) is a perennial plant. More
Photo: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org common purslane Portulaca oleracea
Purslane - Articles Articles

Purslane

Tim Abbey

Purslane (Portulaca oleracea) is a summer annual that forms low growing mats of succulent stems and leaves. More
Photo: Chris Evans, Illinois Wildlife Action Plan, Bugwood.org, catchweed bedstraw, Galium aparine
Catchweed Bedstraw - Articles Articles
Catchweed bedstraw (Galium aparine) is an annual that can form dense mats of vegetation. More
Photo: John D. Byrd; Mississippi State University, Bugwood.org
Yellow rocket - Articles Articles

Yellow rocket

Tim Abbey

Not all weeds get a “cool” common name, but yellow rocket (Barbarea vulgaris) is one of them. More
Photo: John Cardina, The Ohio State University, Bugwood.org poison-hemlock Conium maculatum plant
Poison Hemlock - Articles Articles

Poison Hemlock

Tim Abbey

Poison hemlock (Conium maculatum) appears to have become more abundant over the past few years. More
Photo: Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org eastern poison-ivy Toxicodendron radicans
Poison-Ivy - Articles Articles

Poison-Ivy

Tim Abbey

Poison-ivy (Toxicodendron radicans) is a native woody, perennial vine. More
Photo: Bruce Ackley, The Ohio State University, Bugwood.org prostrate knotweed Polygonum aviculare
Prostrate Knotweed - Articles Articles
Prostrate knotweed (Polygonum aviculare) is a summer annual. More
Photo: Robert Vidki, Doronicum Kft., Bugwood.org henbit Lamium amplexicaule
Henbit—a Common Winter Annual - Articles Articles
Henbit (Lamium amplexicaule), like many of our common weed species, grows in many areas – lawns, landscape plantings, nursery containers, and unmanaged sites. More
Photo: Karan A. Rawlins, University of Georgia, Bugwood.org
Black Medic - Articles Articles

Black Medic

Tim Abbey

Black medic (Medicago lupulina) is a spreading, low growing summer annual. More
quackgrass Elymus repens Stem(s) Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Orchardgrass and Quackgrass - Articles Articles
A number of grass species appear in lawns and ornamental beds and are considered weeds. More
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