IDENTIFICATION
Perennial.
Squarrose knapweed bears numerous groups of four to eight rose-or
pink-coloured flowers on highly branched stems. Lower leaves are deeply
divided. Mature plants are typically between 30 - 45 cm tall. This weed
is very similar in appearance to diffuse knapweed. Unlike diffuse knapweed,
the seedheads fall off at maturity.
DAMAGE
This is a highly competitive weed that can displace native rangeland plants
and reduce forage production for livestock and wildlife.
HABITAT
Squarrose knapweed is well adapted to dry, disturbed areas and
open habitats. It is rare on crop lands or irrigated pasture because it
cannot tolerate cultivation or excessive moisture. It is not present in
British Columbia but it is currently established in Oregon and Washington
state.
SPREAD
The seed heads readily attach to animal fur and vehicle tires.
