CLASS 1A WEEDS
CLASS 1B WEEDS
Blueweed (Vipers bugloss)
Common St. Johnswort
CLASS 2 WEEDS
CLASS 3 WEEDS
Perennial sorghum ssp. (Johnsongrass)
Phragmites (Common reed)
CLASS 4 WEEDS
Cogongrass (Japanese blood grass)
A perennial, Russian knapweed grows two to three feet tall.
Basal leaves are lobed and are two to four inches in length.
Russian knapweed is native to Eurasia. It infests rangelands, field edges, pasture, roadsides, and other disturbed soils. Knapweed's release chemical substances into the soil that inhibit the growth of competing vegetation. It can cause "Chewing disease" in horses that consume it.
It has pinkish flowers. Bloom is early summer through late summer.
Roots are black and may go eight feet deep or more.
Flower bracts have membranous cream-colored tips.