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.
Leaves are up to 12 inches across, round with a slit on one side and
have a smooth, green, leathery surface appearance with the underside
often red or purplish and having numerous veins
Flowers are fragrant, up to 5 inches across and showy with 20 to 30
white, pink, or purple petals and a yellow center
Stems are flexible, attaching either floating leaves or flowers to
thick, submerged rhizomes
After fertilization the flower stalk curls like a corkscrew drawing
the flower underwater
Biology and ecology
A perennial aquatic plant reproducing by seeds and rhizomes
Can form very dense patches, excluding natives
Prefers slow moving rivers, lakes, reservoirs and ponds, growing
in water 3-6 feet deep
Native to eastern North America
Introduced as an ornamental water plant
Control
Prevention –
Learn to
identify plants; know your water bodies; don’t transplant these pretty
plants to your home pond or waterfront shorelines; research nursery and
catalogue specimens before buying
Biological – None known at this time; crass carp don’t eat
waterlilies in WA
Cultural – Healthy native plant communities help reduce
likelihood of establishment but don’t stop it
Mechanical – Cutting, harvesting, covering with bottom barrier
materials
Chemical – Aquatic glyphosate applied to plants, endothall,
dipotassium salt and fluridone applied to the water-permits and special
licenses required; refer to
the
Department of Ecology site for more information about the weed,
permits and control options
pretty in pink
white flowers
slit or notched leaves
infestation
Where found –
Long
Lake, Waitts Lake, Deer Lake, Loon Lake and the Little pend Oreille
Lakes in Stevens County have confirmed populations-may be more wide
spread.
