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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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
Mile-a-minute
Mile-a-minute - Articles Articles

Mile-a-minute

David R. Jackson

Mile-a-minute is an invasive, noxious weed from eastern Asia that is rapidly colonizing non-crop areas in Pennsylvania and surrounding states. More
Autumn Olive
Autumn Olive - Articles Articles

Autumn Olive

David R. Jackson

Autumn olive (Elaeagnus umbellata) is an exotic deciduous shrub and has been listed as a noxious weed throughout much of its range. More
Bush Honeysuckles
Bush Honeysuckles - Articles Articles

Bush Honeysuckles

David R. Jackson

Exotic bush honeysuckles (Lonicera spp.) are upright deciduous shrubs, which out compete many native plant species for natural habitat. More
Fern-dominated forest understories interfere with forest regeneration and provide poor habitat for wildlife. Photo Credit: David Jackson
Controlling Understory Fern Competition for Regeneration Success - Articles Articles
Dense understories of hay-scented, New York, and bracken fern can interfere with the regeneration of hardwood forests, threatening their sustainability. More
Japanese and Giant Knotweed
Japanese and Giant Knotweed - Articles Articles

Japanese and Giant Knotweed

David R. Jackson

Japanese knotweed (Polygonium cuspidatum) and Giant knotweed (Polygonum sachalinensis) are two invasive, exotic weeds found throughout much of the United States and Canada. More
Japanese Barberry
Japanese Barberry - Articles Articles

Japanese Barberry

David R. Jackson

Japanese barberry (Berberis thunbergii) was introduced from Japan around 1875. It now ranges from Nova Scotia south to North Carolina, and westward to Montana. More
Multiflora Rose
Multiflora Rose - Articles Articles

Multiflora Rose

David R. Jackson

Multiflora rose is a noxious, non-native shrub considered an invasive weed because of its aggressive growth habit that excludes native plants. More
Oriental Bittersweet
Oriental Bittersweet - Articles Articles

Oriental Bittersweet

David R. Jackson

Oriental bittersweet is a non-native woody, perennial vine that covers and kills native plants by blocking sunlight, weighing the plants down, and girdling stems and trunks. More
Invasive Weeds - Wild Grape
Invasive Weeds - Wild Grape - Articles Articles

Invasive Weeds - Wild Grape

David R. Jackson

Wild grape (Vitis spp.) is a native vine found throughout Pennsylvania. There are various species of wild grape occurring in a variety of habitats. More
Tree-of-Heaven
Tree-of-Heaven - Articles Articles

Tree-of-Heaven

David R. Jackson

Tree-of-heaven (Ailanthus altissima) also known as ailanthus, Chinese sumac, and stinking sumac is a rapidly growing, deciduous tree native to a region extending from China south to Australia. More