Noxious & Invasive Weed List

Knapweeds are characterized by their vibrant, thistle-like purple or pink flowers atop stiff, upright stems, with bracts that have a distinct comb or fringe-like appearance. 

 Skeleton weed features thin, wiry stems with small yellow flowers, and it lacks significant foliage, giving it a skeletal appearance. 

Thistles are easily recognized by their prickly leaves and stems, topped with purple, pink, or white globe-shaped flowers.

Poison oak has leaves that are lobed and resemble oak leaves, usually in groups of three, turning red in fall; poison ivy also has clusters of three leaflets but with smoother edges, and can grow as a vine or shrub.

This plant has heart-shaped, toothed leaves and tiny, inconspicuous green or white flowers; its stems and leaves are covered with fine hairs that can sting upon contact.

Bulbous bluegrass has a distinctive bulbous base, with fine, wiry stems and a panicle of small, round, bluish-green seed heads.

St. John's Wort is recognized by its bright yellow flowers with numerous stamens and transparent dots on its leaves, which are visible when held up to light.

Blackberry bushes feature thorny canes, compound leaves with toothed leaflets, and clusters of white or pink flowers that mature into the familiar black or dark purple berries.

Common bugloss displays rough, hairy leaves and stems, with vibrant blue flowers that are funnel-shaped, often with white centers and fine red streaks on the petals.

Garlic mustard is identified by its broad, kidney-shaped leaves, small white flowers, and distinct garlic smell when its leaves are crushed.