Control of spotted knapweed
by sheep and
goats will result in severe shedding of leaves, lessened crown,
lessened root, and
above ground growth of premature plants, if grazed properly.
repeated grazing is recommended when
grasses are dormant. This process reduces spotted knapweed
and production. This requires careful management to prevent
of the desirable species. (1)
You must till 2-3 years in a row and combine it with
annual cropping. This will lessen seed in the soil. You
must also follow up
with perennial vegetation seeding or planting. (1)
Pulling: This method should only be used with small scale
infestations and should only be done each spring before plants produce
seeds. You must remove roots for a depth of 2-3 inches to kill
Removed plants should be bagged and disposed of off site. (1) *Wear
gloves when pulling knapweed!
Burning: Burning is not effective in controlling spotted
knapweed infestations. (1)
& Reseeding: Is an important step when the beneficial plant
community makes up less than 30% of all the vegetation. (1)
Is not practical on sites that are rocky or steep or where shrubs are
present. Repeated mowing can cause prostrate (the plant stems
grow flat along the ground) growth which may still
Over watering can be detrimental to spotted knapweed.
benefit the plants surrounding it therefore, killing the knapweed. (1)
Fertilization can be beneficial to surrounding plant life.
turn the surrounding plant life will out compete with the knapweed
eventually killing it. (1)
Photo by Mr. Breitenfeldt, WHS parking lot, 1990's.
1) Missoula County Weed
Home Page. Spotted Knapweed-Centaurea maculosa. [Online] Available
February 18, 2006.
Terry Woodbury, 02/2006.
to Cultural Control mtwow.org