Stevens County Noxious Weed Control
Board This web site will help
you identify & control noxious weeds. Conventional & biological control
(BioControl) information and photographs are here. Maps & related
information are included.
Has five pale, ‘sulfur’ yellow, heart shaped petals per
flower in flat-topped clusters
Each compound leaf has 5-7 toothed leaflets
The sparsely hairy leaves appear green on the underside, not
silvery as with native cinquefoils ("green & green =
mean"; "green & white, it’s all right")
Palmate toothed leaves resemble Marijuana
Lower leaves are alternate on long hairy stems
Stiffly erect stalks or clumps with woody base
Biology and ecology
A perennial, 1 to 2 feet tall, with a tap root
Sometimes scattered but can form monocultures in range,
roadsides and abandoned fields and even undisturbed areas
Unpalatable to livestock and wildlife
Flowers from May to July
Has extensive woody rootstocks
Many native cinquefoils in our area but flowers are either
white or brighter yellow/gold
Control
Prevention –
Learn to
identify plants; know your property; beware of fill dirt, hay and
seed from outside your area
Biological – None available at this time
Cultural – Competitive vegetative cover helps but does
not completely prevent infestation
Mechanical – Repeated tillage or digging is effective
Chemical – Several herbicides effective at label rates
but may require repeat treatment because of extensive woody root
system.
The
PNW Weed Management Handbook does not have this weed listed for
control recommendations
sulfur yellow flowers
palmate leaves
Where found – Scattered
through out Stevens County with dense stands in some range, waste
and untended field situations, especially in southern reaches.
