Biennial & Perennial Weeds
KNAPWEED: BROWN and SPOTTED Centaurea stoebeand L. and Centaurea jacea Life Cycle: Biennial/Perennial Plant Description: 22 different knapweed (Centaurea
spp) species are well established in the United States. Spotted (biennial) and brown (perennial) knapweed overlap in distribution and share similar characteristics. Spotted spreads by seed, but brown knapweed can also spread from root crowns. Seedlings emerge during the growing season to
form rosettes. Rosettes send up a flowering stalk in the summer.
Spotted knapweed has leaves divided into lobes while brown knapweed leaves are lance shaped. Treatment: Apply 16 to 20 fluid ounces of DuraCor ®
herbicide per acre or 24 fluid ounces of NovaGraz ™ herbicide plus 1% MSO v/v per acre, or 1.5 to 2.1 pints of GrazonNext ® HL herbicide per acre, or 20 to 32 fluid ounces of GrazonPD3 ™ herbicide per acre during vegetative plant stage in both the spring and fall.
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