Weed Management

Information on weed management and control of ornamentals and floriculture, including poison hemlock, horseweed, carpetweed, mulberry weed, ragweed and multiflora rose. Tips on organic land care and weeds in the field.

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Photo: Ohio State Weed Lab, The Ohio State University, Bugwood.org common mallow (Malva neglecta)
Landscape Management: Common Mallow - News News
Considered a weed in turfgrass and landscape beds, common mallow is an interesting plant in that it can be an annual or biennial. More
Epipactis helleborine. Photo: Amy Korman, Penn State
Be on the Lookout for Invasive Orchids - News News
Epipactis helleborine, the Broad-leaved Helleborine, is an invasive orchid that continues to plague Pennsylvania landscapes. More
Zenik Crespo (back, right) assists Hispanic participants as they identify weeds at Johnston’s Everygreen Nursery in Erie. Photo: L. Follett, Johnston’s Evergreen Nursery
Bilingual Workshops Teach Integrated Weed Management - Articles Articles
Penn State Extension has developed new resources for weed management and is beginning to offer bilingual training opportunities. More
Green Industry Conference
Green Industry Conference - Conferences Conferences

Green Industry Conference

01/03/2019

Doylestown, PA

$80.00
Green industry professionals are invited to join us for professional development and networking opportunities. More
Controlling Weeds in Nursery and Landscape Plantings
Controlling Weeds in Nursery and Landscape Plantings - Articles Articles

Controlling Weeds in Nursery and Landscape Plantings

Tracey Lynn Harpster, Jim Sellmer, Ph.D., Larry Kuhns

This guide explains how people who grow and maintain landscape and nursery plantings can develop effective weed control programs. More
Landscaping Field Day
Landscaping Field Day - Workshops Workshops
This one-day event will provide professional managers with educational opportunities geared toward the green industry. More
Photo: Chris Evans, University of Illinois, Bugwood.org, Queen Anne's lace, wild carrot, Daucus carota
Wild Carrot or Queen Anne’s Lace - Articles Articles
Wild carrot or Queen Anne’s lace (Daucus carota) is a biennial. More
Queen Anne’s Lace is commonly found along roadsides
Is It a Weed? - Articles Articles

Is It a Weed?

Tom Butzler

Controlling weeds is important in landscape beds. They appear unsightly and compete with the desirable plants for light, nutrients, moisture. More
Identificación y localización de maleza: adiestramiento de campo
Identificación y localización de maleza: adiestramiento de campo - Workshops Workshops
Productores y trabajadores agrícolas están invitados a participar en esta curso de adiestramiento sobre identificación, localización y el control de malezas. More
Weed Identification and Scouting: a Field Training in English and Spanish
Weed Identification and Scouting: a Field Training in English and Spanish - Workshops Workshops
Growers, managers, and agricultural and green industry workers are invited to this in-field training on the identification, scouting and control of weeds. More
Photo: Howard F. Schwartz, Colorado State University, Bugwood.org, dandelion, Taraxacum officinale
Dandelion as a Landscape Weed - Articles Articles
Dandelion is a perennial weed of lawns, landscape ornamental beds, and nurseries. More
Organic Land Care Best Management Practices Manual
Organic Land Care Best Management Practices Manual - Articles Articles
This free manual provides recommendations to land managers and landscape contractors on best management practices for effectively conducting organic land care. More
Horseweed. Photo: Bill Curran, Penn State
Horseweed—a Winter and Summer Annual - Articles Articles
Horseweed (Conyza canadensis) also known as marestail, reproduces by seeds. More
Photo: Loke T. Kok, Virginia Polytechnic Institute and State University, Bugwood.org, bull thistle, Cirsium vulgare
Bull Thistle Identification and Management - Articles Articles
Bull thistle (Cirsium vulgare) is a biennial that true to its name, has notable spines. This plant is much different than Canada thistle. More
Photo: Mark Czarnota, University of Georgia, Bugwood.org
Mulberry Weed - Articles Articles

Mulberry Weed

Tim Abbey

A weed that has been spreading in recent years in the nursery and landscape trade is mulberry weed. 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: 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
Photo: Rebekah D. Wallace, University of Georgia, Bugwood.org carpetweed Mollugo verticillata
Carpetweed - Articles Articles

Carpetweed

Tim Abbey

Carpetweed (Mollugo verticillata) is a low-growing, multi-shoot annual that grows into a circular mat. 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: Bruce Ackley, The Ohio State University, Bugwood.org prostrate knotweed Polygonum aviculare
Prostrate Knotweed - Articles Articles

Prostrate Knotweed

Tim Abbey

Prostrate knotweed (Polygonum aviculare) is a summer 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
Catoctin Mountain Orchards using black plastic mulch and straw between rows.
Weed Control in Cut Flowers - Articles Articles
Managing weeds in cut flowers often requires different approaches depending on the specific weed, specific flower or woody stem, time of year and level of weed infestation. More
Veronicastrum virginicum - culver's root
Weeds in the Fields - Articles Articles

Weeds in the Fields

Mary Ann Ryan

When driving, we often see flowering weeds in fields or roadsides. Casual walks along a country road may cause us to stop and check out the weeds of summer. More
Images 1. Common ragweed. DiTomaso, J. UC-Davis, Bugwood.org.
Keep an Eye Out for the Ragweeds - Articles Articles

Keep an Eye Out for the Ragweeds

Dwight Lingenfelter, William S. Curran, Ph.D.

Members of the Aster family, particularly the ragweeds, are never good neighbors and it’s key to understand what your post treatment options are. 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
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