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Garlic Mustard
Alliaria petiolata
Garlic mustard is a biennial herb that grows as a rosette of kidney-shaped leaves in the first year. The second-year plant can grow multiple stems up to 4 ft. with triangular, sharply-toothed leaves. In May, four-petaled, white flowers grow in clusters at the top of the stem. Garlic mustard produces a multitude of seeds, which can remain viable for seven years or more.
Giant Hogweed
Heracleum mantegazzianum
Giant hogweed is a biennial herb that can grow 8-14 ft tall. Plants sprout in early spring from forked taproots or seeds. Stems are hollow, and leaves are lobed. The best time to identify giant hogweed is when it is in bloom in June.
Giant Reed
Arundo donax
Giant reed is a perennial grass capable of growing up to 20 feet tall. Its leaves are up to 2 feet long and opposite in arrangement. It flowers in late summer with a purple to silver feathery plume atop its stem.
Glossy Buckthorn
Frangula alnus
Glossy buckthorn is a deciduous shrub, or small tree, that can grow up to 30 ft in height. Bark is dark gray to brown with white lenticels.
Hardy Kiwi
Actinidia arguta
Hardy kiwi readily germinates under a closed canopy and can climb up and smother surrounding vegetation. This allows it to crowd out native vegetation and reduce biodiversity. Hardy kiwi is an Approaching Region Priority Species.
Hemlock Woolly Adelgid
Adelges tsugae
HWA is a tiny, aphid-like insect that was first reported in the eastern United States in the 1950's. Its name derives from a white "wool-like" covering, called an ovisac, on mature egg-laying adults.
Japanese Angelica Tree
Aralia elata
The Japanese angelica tree is a deciduous shrub or tree that can grow up to 40 feet in height. The tree is multi-stemmed, and the bark is covered in sharp thorns.
Japanese Barberry
Berberis thunbergii
Japanese barberry is a deciduous shrubs that can grow 8 ft. tall. It has grooved stems with single or paired thorns in the nodes.