Kootenai County Seal, Administration Building, and Lake
  

Weed Specialists
Email: kcnoxiousweeds@kcgov.us
P: (208) 446-1290
F: (208) 446-1282

Physical Address:
Click here for map.
10905 N. Ramsey Road
Hayden, ID 83835

Office Hours:
Mon - Fri 8:00a.m. - 4:30p.m.

 Switch to Descending Order Displaying: 1-20 of 30 Next Results

1BUFFALO BUR (1623 Views)
*BOTANICAL NAME:* ^Solanum rostratum^ *WHAT DOES IT LOOK LIKE?* Buffalobur is a native North American plant. The name dates back to the time of settlement of the Great Plains when the plant grew abundant in the disturbed soil of buffalo wallows. Buffalo carried the burs great distances in their shaggy coats. Buffalobur, a member of the potato family, is an annual weed that grows up to 2 feet tall. The stems are erect and bushy. The five to seven lobed leaves are covered by short yellow star-like hairs. The bright yellow flowers are five-lobed and wheel shaped. The seedpod is encased in a spiny bur. The entire plant, except for the flower petals, is covered by straight yellow spines. To identify buffalobur, look for the tomato-like yellow flowers and unique, extremely prickly leaves, stems and fruit. - *WHERE DOES IT LIKE TO GROW?* This spiny plant can be found in fields, overgrazed...

2CANADA THISTLE (626 Views)
*BOTANICAL NAME:* ^Cirsium arvense^ *WHAT DOES IT LOOK LIKE?* A creeping perennial that can grow 1 to 5 feet tall. Numerous flower heads are small and urn shaped; flowers are normally pink, but can be white to purple. Leaves are spiny with the underside often appearing white. *WHERE DOES IT GROW?* Canada thistle is found almost anywhere. It prefers rich, moist soils, but will grow in dry conditions. *WHEN DOES IT BLOOM?* Flowering occurs June through August. *HOW DOES THIS PLANT SPREAD?:* New plants grow from wind blown seed or from roots. Roots grow under the soil surface producing shoots that make new plants. Seeds may germinate immediately, or remain in the soil until conditions are favorable. *HOW DO I CONTROL IT?* Using a variety of methods is the key to a successful Canada thistle control program. - *NON-CHEMICAL CONTROL* - Overseeding with desirable grasses and fertilizing can...

3COMMON BUGLOSS (475 Views)
*BOTANICAL NAME* ^Anchusa officinalis^ *WHAT DOES IT LOOK LIKE?* Common bugloss is a perennial with a deep taproot that can grow 1 to 2 feet tall. Each plant can have several flowering stalks with hairy, angular stems. The slightly pointed leaves are succulent and fleshy and covered with stiff hairs. The flowers are on the ends of the stalks, blue to purple in color, with white centers. Each flower stem is coiled like a fiddleneck at first and as each flower bud opens, the coil gradually straightens out. Common bugloss is often mistaken for vipers bugloss. *WHERE DOES IT LIKE TO GROW?* This native of Russia prefers dry, sandy to gravelly soils and will invade pastures, rangelands, alfalfa fields and waste areas. *WHEN DOES IT BLOOM?* Attractive purple blooms start to appear at the end of the stalks in May. The first year growth is a rosette; the second year a single flower stalk...

4DALMATIAN TOADFLAX (2653 Views)
*BOTANICAL NAME* ^Linaria genistifolia^ *WHAT DOES IT LOOK LIKE?* A perennial plant that sends up several stems from the root crown and can grow to 4 feet tall. It has waxy, heart-shaped green leaves and bright yellow flowers that are similar in shape to a snapdragon. *WHERE DOES IT LIKE TO GROW?* Dalmatian toadflax is an aggressive weed of pastures, roadsides, abandoned lots, and overgrazed rangelands. It is difficult to control, once established, due to it's extensive root system. Dalmatian toadflax roots may penetrate the soil 4 to 10 feet deep. *WHEN DOES IT BLOOM?* Dalmatian toadflax begins to flower in May and June in our area and will continue blooming until early fall. *HOW DOES IT SPREAD?* Plants can spead by horizontal creeping roots or by seed. New rosettes begin forming in the fall and are visible once the snow has left the ground in the spring. - Using different control...

5EURASIAN WATERMILFOIL (488 Views)
*BOTANICAL NAME* ^Myriophyllum spicatum^ *WHAT IS EURASIAN WATERMILFOIL?* It is an extremely aggressive non-native water weed. Eurasian watermilfoil crowds out native plants and forms thick, floating mats on the surface of the water that make boating, fishing and swimming almost impossible. *WHAT DOES IT LOOK LIKE?* It is a submersed, rooted perennial plant with smooth stems that branch near the water surface. This branching can form large, floating mats of vegetation on the surface of lakes, rivers and other water bodies, preventing light from reaching native aquatic plants. The leaves of eurasian milfoil are feathery and occur around the stem. Each leaf is 1/2 to 2 inches long, with 12 to 21 pairs of fine, thin leaflets. The leaves rarely extend above the water surface and will collapse around the stem when removed from the water. The upper portion of the plant often develops a...

6FIELD BINDWEED (584 Views)
*BOTANICAL NAME* ^Convolvulus arvensis^ *WHAT DOES IT LOOK LIKE?* A stubborn, low-growing perennial vine that has stems that twine and spread to form a mat on the ground or can climb up to 7 feet, blocking sunlight from other plants as it grows. Leaf size and shape varies but generally the leaves are one to two inches long, smooth, and shaped like an arrowhead. The petunia-like flowers and flower petals can be white to pale pink. *WHERE DO THEY LIKE TO GROW?* Brought in from Europe, field bindweed can be found growing anywhere there is strong sunlight and good moisture conditions. It will grow up and over anything in its path. *WHEN DOES IT BLOOM?* Flowering occurs from late June until frost in the fall. New plants can begin from seed or from the creeping root system. *HOW DOES IT SPREAD?* Buds located along the root can send up new shoots, or establish a new patch when roots are cut...

7HAWKWEED (444 Views)
*BOTANICAL NAME:* Yellow Hawkweed ^(Hieracium caespitosum; Hieracium pratense)^ or Orange Hawkweed ^(Hieracium aurantiacum)^ *WHAT DO THEY LOOK LIKE?* Yellow and orange hawkweed are perennials with a shallow root system. Leaves are hairy, up to 6 inches long, and found at the base of the plant. A cluster of flowers appear at the end of stems which come up from a low growing clump of leaves. *WHERE DO THEY LIKE TO GROW?* Hawkweeds can be found in moist grasslands, forest meadows, abandoned fields, clear cuts, roadsides and established lawns and gardens. Once hawkweeds get started in an area, they can quickly form dense patches. If they are not controlled, these patches can expand into large areas and push out desired plants. *WHEN DO THEY BLOOM?* Bloom time is from late May to mid June with seed set in August. *HOW DO THEY SPREAD?* Hawkweeds reproduce by seeds which blow in the wind....

8HOARY ALYSSUM (499 Views)
*BOTANICAL NAME:* ^Berteroa icana^ *WHAT DOES IT LOOK LIKE?* Hoary alyssum can be an annual, biennial or a short lived perennial that can grow to 3 feet tall. Leaves and stems are covered with fine whitish hairs giving the plant a gray-green appearance. Multiple thin stems branch near the top where clusters of white flowers appear. *WHERE DOES IT GROW?* This introduced member of the mustard family can be found in pastures, on road shoulders and along railroad tracks. It prefers dry, sandy or gravelly soil. *WHEN DOES IT BLOOM?* Small white flowers appear from May to September. *HOW DOES THIS PLANT SPREAD?:* This tap rooted plant reproduces only by seed. Small, oblong, flattened seed pods appear along the stem and each seed pod can containg 2 to 6 seeds. *HOW DO I CONTROL IT?* As with any weed control program, proper pasture and hay management is the first consideration. This includes...

9HOUNDSTONGUE (479 Views)
*BOTANICAL NAME:* ^Cynoglossum officinale^ *WHAT DOES IT LOOK LIKE?:* A biennial, it forms a rosette (leaves near the ground in a circle with no visible stem) the first year. The second year the plant produces a single, hairy, course flowering stalk that can grow 1 to 4 feet tall with a thick, black, woody taproot. The leaves are oblong and rough, like a hound's tongue. The flowers are small and reddish-purple and appear at the end of the stems. *WHERE DOES IT LIKE TO GROW?:* Houndstongue plants generally are found along trails and roadsides, on the edge of wooded areas and in disturbed areas. - *WHEN DOES IT BLOOM?:* Small, attractive reddish-purple flowers begin to appear in June and seeds are formed and dropped by the end of the summer. *HOW DOES THIS PLANT SPREAD?:* This plant reproduces only from seed, but can spread great distances because the barbs on the seed pod cling to...

10JAPANESE KNOTWEED (443 Views)
*BOTANICAL NAME:* ^Polygonum cuspidatum^ *WHAT DOES IT LOOK LIKE?* This perennial plant forms large shrub-like clusters and can grow from 4 to 8 feet tall. The leaves are heart shaped with a flattened top and grow 2 to 6 inches long. The reddish stems are hollow, smooth and jointed, similar to bamboo stems. The plant dies back in the winter and the tall, dead, brown stems remain standing. Common names include: bamboo, Japanese bamboo, fleece flower and Mexican bamboo. *WHERE DOES IT GROW?* A native of Asia, Japanese knotweed was brought into the US as a garden ornamental in the late 1800's. Although it grows best in sunny moist areas, it can do well in a variety of soil types. It is often found along stream banks, roadsides, ditches, around home sites and in pastures. Once established, it can form very dense clusters. - *WHEN DOES IT BLOOM?* Drooping clusters of small whitish to...

11KOCHIA (390 Views)
*BOTANICAL NAME* ^Kochia scoparia^ *WHAT DOES IT LOOK LIKE?* A bushy annual that can grow from 1 to 6 feet tall depending upon conditions. It reproduces by seed and each plant can produce 14,600 seeds. As the plant dies in the fall it turns red, hence the common name of "Mexican Fireweed", and it becomes a tumbleweed, dropping seeds as it moves. *WHERE DOES IT LIKE TO GROW?* A native of Eurasia, Kochia can grow just about anywhere. It is a drought tolerant plant that was brought into our country as a garden ornamental. It is found in pastures, rangeland, roadsides, ditch banks, and cultivated fields. *WHEN DOES IT BLOOM?* The seeds germinate in early spring. Tiny green flowers begin blooming in late summer and produce seed into October. - *NON-CHEMICAL* - Prevent weeds from going to seed. Control them before the seeds can spread. Pulling seedlings is an effective method of control. -...

12LARGE KNOTWEEDS (256 Views)
*BOTANICAL NAMES:* ^Polygonum cucupidatum^ _JAPANESE KNOTWEED_ - has small greenish-white to cream colored drooping flower clusters that appear at the ends of stems and in leaf axils. ^Polygonum sachaliinense^ _GIANT KNOTWEED_ - distinguished by large heart-shaped leaves up to 12 inches long. ^Polygonum bohemicum^ _BOHEMIAN KNOTWEED_ - is a hybrid of Japanese and giant knotweed that has greenish-white to cream upright flower clusters. *WHAT DO THEY LOOK LIKE?* They are woody, upright perennials that grow from 4 to 9 feet tall. The bamboo-like stems are green with red or purple spots. *WHERE DOES IT GROW?* Large knotweeds are found growing along roadsides, ditch banks, waste areas and pastures. *HOW DOES IT SPREAD?* These perennials spread from long creeping roots and stem pieces. - Because of knotweeds extensive root system, once this weed is established it is difficult to control....

13LEAFY SPURGE (554 Views)
*BOTANICAL NAME:* ^Euphorbia esula^ *WHAT DOES IT LOOK LIKE?:* Leafy spurge is an aggressive perennial weed that can grow to 3 feet tall and up to 20 feet deep. It has bluish-green narrow leaves and showy yellowish green, heart-shaped leaves which surround a small flower. Stems and leaves ooze a milky latex sap when broken. This sap can seriously irritate the skin of people and animals, and can cause human blindness if rubbed into the eye. *WHERE DOES IT LIKE TO GROW?:* It can be found in any type of soil and is commonly found in rangeland, pastures, roadsides, waste areas and wetland sites. Although leafy spurge grows best in unmanaged sites, it will invade cultivated sites as well. *WHEN DOES IT BLOOM?:* Flowering begins in May and continues into the fall. *HOW DOES IT SPREAD?:* Leafy spurge seed capsules open exposively shooting the seed up to 15 feet from the parent plant. The seeds...

14OXEYE DAISY (580 Views)
*BOTANICAL NAME:* ^Chrysanthemum leucanthemum^ *WHAT DOES IT LOOK LIKE?:* A short-lived perennial with daisy-like flowers that sit at the end of stalks that can be 1 to 3 feet tall. The flowers are made up of white petals with a golden center or "eye". The glossy green leaves get smaller as they go up the stem. It is also known as Field Daisy, Marguerite Daisy, Poverty Weed, Mid-summer Daisy and Dog Daisy. It grows very rapidly, crowding out more desirable plants. *WHERE DOES IT LIKE TO GROW?:* Brought in from Europe as an ornamental garden plant, it can be found in meadows, overgrazed pastures, roadsides and abandoned properties. - *WHEN DOES IT BLOOM?:* Flowering occurs June through August. *HOW DOES THIS PLANT SPREAD?:* New plants can start from seed and also from the spreading roots. Small plants can produce 1,300 to 4,000 seeds per plant. *HOW DO I CONTROL IT?* Oxeye daisy often...

15POISON HEMLOCK (357 Views)
*BOTANICAL NAME:* ^Conium maculatum^ *WHAT DOES IT LOOK LIKE?* Poison hemlock is a tall biennial. That means it forms a rosette but does not flower during its first year of growth. In the second year, a tall, erect flowering stem will grow up to 12 feet. Poison hemlock has a long, white taproot and the stem is strong, smooth and covered with purple spots. The fine leaves are fern-like in appearance. *WHERE DOES IT GROW?* Poison hemlock can be found along roadsides, edges of cultivated fields and on stream and ditch banks. It prefers wet soil conditions but can survive in dry sites. *WHEN DOES IT BLOOM?* Small erect clusters of white flowers appear in July and August. Each flower develops into a green, deeply ridged fruit that contains several seeds which turn gray-brown when ripe. *HOW DOES IT SPREAD?* Poison hemlock reproduces only from seed. Seeds will drop next to the parent plant or...

16POLICEMAN'S HELMET (270 Views)
*BOTANICAL NAME* ^Impatiens glandulifera^ *WHAT DOES IT LOOK LIKE?* This annual plant can grow 3 to 8 feet tall with hollow upright stems that have a reddish or purple tinge. The root system is small and shallow. The 6 inch long leaves are oblong with serrated edges. The flowers, which resemble an English policeman's helmet, can be white to all shades of pink and purple. This plant is also known as Himalayan Balsam. The State of Idaho listed this plant on their noxious weed list in 2007. *WHERE DO THEY LIKE TO GROW?* Policeman's helmet likes to grow in sun or partial shade and is tolerant of many soil types. This plant requires high moisture content in the soil, but not necessarily standing water. You can find this plant growing in lowland, riparian areas which include wetlands, moist forests, in roadside thickets and stream and river edges. Policeman's helmet is often found in home...

17PUNCTUREVINE (1084 Views)
*BOTANICAL NAME* ^Tribulus terrestris^ *WHAT DOES IT LOOK LIKE?* Puncturevine is a low growing annual that can make dense mats up to 5 feet across. Small 1/2 inch, 5 petal yellow flowers appear soon after germination followed by seed capsules with 2 sharp spines resembling the head of a goat often giving the plant the common name of goatheads. *WHERE DOES IT LIKE TO GROW?* This plant grows best in dry, loose, sandy soils but can survive in almost any type of soil. Usually reported first near agricultural sites or railroad yards, the weed is often found in hay, straw or manure. *WHEN DOES IT BLOOM?* Puncturevine begins germinating during warm spring weather and continues until frost. Bright yellow flowers will begin to appear as early as 3 weeks after germination with seeds appearing one to two weeks later. The flowering time extends from June to October. Flowers are only open in the...

18PURPLE LOOSESTRIFE (302 Views)
*IDENTIFICATION* Purple Loosestrife ^(Lythrum salicaria)^ *WHAT DOES IT LOOK LIKE?* A perennial that can grow 5 to 8 feet tall. Stems are usually 4 sided with many branches and narrow leaves. Showy spikes of purple-pink flowers bloom from mid to late summer. Plants are long lived and mature plants may produce more than 2.5 million seeds per year. A native of Europe, loosestrife came to the U.S. in the early 1800's as seed contained in soil used as ships ballast and as a medicinal herb. Today it is often sold in seed and plant catalogs as an ornamental. *WHERE DOES IT LIKE TO GROW?* Loosestrife prefers to grow in moist soils in marshes, stream banks, ditches and along shorelines. If left to grow wild, loosestrife will clog the wetland or waterway leaving no room for native plants, fish or water birds and animals. Once a colony of loosestrife becomes established, it is very difficult to...

19RUSH SKELETONWEED (276 Views)
*BOTANICAL NAME:* ^Chondrilla juncea^ *WHAT DOES IT LOOK LIKE?* Rush skeletonweed is a perennial whose branched stems may be 4 feet tall and appear leafless. The lower 4 to 6 inches of the stems are covered with coarse brown hairs. The dandelion-like rosettes, that form in the fall, die as the plant ages. When the plant is cut or broken, it oozes a milky white latex sap. Rush skeletonweed was first reported in the U.S. near Spokane, Washington in 1938. It was found in Idaho and Oregon during the 1960's. *WHERE DOES IT GROW?* This weed thrives in well drained, sandy textured or rocky soils, along roadsides, in rangelands, pastures and grain fields. - *WHEN DOES IT BLOOM?"* Small yellow flowers begin in early summer and continue until frost in the fall. Seeds mature 9 to 15 days after the flowers open. Each seed has a parachute of fine hairs which allow it to travel long distances by...

20SCOTCH BROOM (267 Views)
*BOTANICAL NAME:* ^Cytisus scoparius^ *WHAT DOES IT LOOK LIKE?* Scotch broom is a woody plant with mostly erect branches that can grow to 10 feet tall. The branches are dark green and five sided. The leaves are small - about 1/2 inches long. New leaves, produced in the spring often fall off during dry summer months. The plant may be leafless for most of the year. The flowers resemble those of a pea plant and are bright yellow. Scotch broom can form dense brush fields and this diminishes habitat for grazing animals. *WHERE DOES IT LIKE TO GROW?* This plant likes to grow in well drained sites. It spreads rapidly along roads, where the seed becomes imbedded in the tires of passing vehicles. It can be found in pastures, cultivated fields, forests and home landscapes. - *WHEM DOES IT BLOOM?* Bright yellow flowers begin to appear in our area in May and June. *HOW DOES THIS PLANT SPREAD?* Seed...

   Next >