Learn to
identify plants; know your property; beware of fill dirt, hay and seed
from outside your area
Biological – Some established in county but not demonstrating
substantial effect to date
Cultural – Good vegetative cover helps prevent initial
infestations; can invade and dominate healthy sites
Mechanical – Very difficult because breaking up of roots serves
to increase the number of plants; regular cutting or tillage can wear
down plant reserves and reduce population and vigor but results are
often erratic
Chemical – Some effective at label rates if strict attention is
paid to timing (usually at bud stage and/or fall) which helps promote
translocation to extensive root system;
refer to the
PNW Weed Management Handbook for specific chemical recommendations
