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 21 Next Results

1BLACK MEDIC (566 Views)
*BOTANICAL NAME* ^Medicago lupulina^ *WHAT DOES IT LOOK LIKE?* The leaves are clover shaped and dark green. A shallow rooted plant with many stems that are slender, grow flat to the ground, are slightly hairy and can spread out 1 to 2 feet from the main taproot. The bright yellow flowers are clustered on short stems. The flowers are actually a cluster that is about 1/2 inch long, round and comprised of up to 50 individual flowers. *WHERE DOES IT GROW?* Black medic is common in lawns, sidewalk cracks, roadsides, stream valleys, pastures and fields. *WHEN DOES IT BLOOM?* Flowering begins in April and continues into October. *HOW DOES IT SPREAD?* It usually grows as an annual, sprouting from seeds in the spring. - *NON-CHEMICAL* - Good turf management practices, including a balanced nitrogen/phosphorus fertilization program, will encourage a dense stand of turf and make it difficult for...

2BULBOUS BLUEGRASS (640 Views)
*BOTANICAL NAME* ^Poa bulbosa^ *WHAT DOES IT LOOK LIKE?* Bulbous bluegrass is a short-lived perennial cool-season grass. This grass develops bulbs at the base of the plant which are normally dormant from mid-May through early October when leaves will begin to emerge. By early March, the plant is usually about 3 inches tall. Fields of mature bulbous bluegrass have a dark purple cast. *WHERE DOES IT LIKE TO GROW?* Bulbous bluegrass is a weedy plant in pastures, grain fields and along roadsides. It prefers shallow soils that are moist during the winter and early spring. *HOW DOES THIS PLANT MULTIPLY?* Bulbous blue grass is unique because it does not produce true seeds. It grows from bulbs that develop at the base of the plant. These bulbs multiply, sending new bulbs out to the side of the plant. The flowers of bulbous bluegrass produce dark purple bulbils rather than seed. After a dormant...

3CANADA FLEABANE (640 Views)
*BOTANICAL NAME* ^Conyza canadensis^ *COMMON NAMES:* Horseweed, mare’s-tail, fleabane, bitterweed *WHAT DOES IT LOOK LIKE?* Most seedlings of this plant sprout from late August through October, and form rosettes that overwinter. Some seeds will germinate in spring, from March through early May. Plants can grow from 1 to 5 feet tall. Many, inconspicuous flower heads appear on short branches toward the top of the plant. Each plant consists of one erect stalk that branch on the upper half of the plant. The dark green leaves and other parts of the plant, when crushed, have a faint but distinctive carrot-like odor. The leaves of this plant been used in the making of an insect repellent. *WHERE DO THEY LIKE TO GROW?* A native of North American grasslands, horseweed is common in pastures, meadows, cultivated fields and along roadsides. It can be found on all soil types, including organic soils...

4CATSEAR (10377 Views)
*BOTANICAL NAME:* ^Hypochoeris radicata^ *WHAT DOES IT LOOK LIKE?* This rapid growing perennial plant is often mistaken for a dandelion. It forms a cluster of hairy leaves at the base of the plant with 8 to 16 inch tall, stiff, wiry, smooth stems that are often branched near the top. At the tip of each branch is a single yellow flower head. This plant is also known as common catsear, hairy catsear, false dandelion, flatweed, spotted cat’s–ear. *WHERE DOES IT LIKE TO GROW?* Catsear will germinate and grow in pastures, lawns, roadsides and in any disturbed or neglected soil. *WHEN DOES IT BLOOM?* The dandelion-like yellow flowers start appearing in May and will continue through the summer. *HOW DOES IT SPREAD?* Catsear reproduces by seed and vegetatively by way of buds formed on the crown that can produce new plants. The seed is orange-brown and has fine, toothed ribs and a long slender...

5CHEATGRASS (DOWNY BROME) (1036 Views)
*BOTANICAL NAME:* ^Bromus tectorum^ *WHAT DOES IT LOOK LIKE?* This aggressive winter annual(seeds usually germinate in the fall)is often known as downy brome. The seedlings are bright green and have hairy leaves. The stems are upright and slender and may also be slightly hairy. The stem tips, where the seeds are located, droop slightly. This grass has an overall fine, soft appearance and typically grows 3 inches to 2 feet tall. As this grass dries out, it begins to turn a purplish color. Plants dry to a straw color by early summer. *WHERE DOES IT LIKE TO GROW?* This invasive grass likes to grow in rangelands, cultivated fields, abandoned or overgrazed pastures and even in a city garden. - *HOW DOES THIS PLANT SPREAD?* This plant reproduces only by seed. Seeds are scattered by the wind, by animals (it sticks to their fur) and by man ( it sticks to shoelaces and socks). *HOW DO I CONTROL...

6CHICORY (1842 Views)
*BOTANICAL NAME:* ^Cichorium intybus^ *THIS IS PLANT IS NOT ON THE IDAHO OR THE KOOTENAI COUNTY NOXIOUS WEED LIST* *WHAT DOES IT LOOK LIKE?* A bushy perennial herb that reproduces only by seed. It has a parsnip-like root and bottom leaves that resemble those of a dandelion. The stem leaves are very small and the plant can grow to 6 feet. The plant is easily recognized by its sky blue colored flowers which open and close daily. Chicory is also known by several other names: blue daisy, blue dandelion, blue sailors, coffeeweed, cornflower and wild endive. *WHERE DOES IT GROW?* This plant was brought to the U.S. from the Mediterranean area for use as a salad green and a coffee substitute. It's cultivation in North America began in the 1700's and ended in about 1950 when it became more economical to import Chicory. The roots of Chicory are roasted, ground and used as a caffeine free coffee...

7COMMON CHICKWEED (612 Views)
*BOTANICAL NAME* ^Stellaria media^ *WHAT DOES IT LOOK LIKE?* It is an annual that tolerates cold weather so well that it can survive winter in mild climates. A member of the Pink or Carnation family (Caryophyllaceae), it is related to some of our prettiest wildflowers. It grows erect to prostrate and sometimes is matlike. *WHERE DOES IT GROW?* Common chickweed grows in gardens, fields, new (unestablished) lawns, flower beds, ornamental plantings, and other areas with rich soils. It grows best in cool, moist locations. *WHEN DOES IT BLOOM?* Flowers usually develop from February to September, but under favorable conditions they can occur year-round. The small, yet showy, flowers have what appear to be 10 petals, but are really five deeply-cut white petals. *HOW DOES IT SPREAD?* Common chickweed reproduces mostly from seed, but sometimes it reproduces by creeping stems that root from stem...

8COMMON MULLEIN (1874 Views)
*BOTANICAL NAME:* ^Verbascum thapsus^ *WHAT DOES IT LOOK LIKE?* Common mullein, also known as woolly mullein, is a biennial. That means it forms a rosette during the first year of growth and in the second year, a flowering stem rises froom the deep taproot. The flowering stem can grow 5 to 10 feet tall. The plant is light green in color and the leaves are heavily covered on both sides with hairs giving them a "fuzzy" feeling. *WHERE DOES IT GROW?* Mullein will grow in almost any open area including open meadows and forests as well as neglected pastures and road sides. It prefers dry, gravelly soil. *WHEN DOES IT BLOOM?* Sulfur-yellow flowers appear along the tall flower stalk starting in late spring and continuing into the fall. *HOW DOES THIS PLANT SPREAD?:* Mullein reproduces entirely by seed. An individual plant produces 100,000 to 180,000 seeds. After dropping their seeds, the plant...

9COMMON PURSLANE (707 Views)
*BOTANICAL NAME* ^Portulaca oleracea^ *WHAT DOES IT LOOK LIKE?* Purslane is a fleshy, prostrate annual with smooth reddish or flesh-colored stems. The smooth, shiny, succulent leaves are somewhat teardrop-shaped, wider at the tip than at the base. The succulent leaves of this plant are valuable as a thickener when added to soups and stews. They can be eaten cooked or raw and make a good potherb, though it has never attained importance here as it has in India, Middle East and Europe. *WHERE DOES IT LIKE TO GROW?* Introduced from Europe, common purslane has become a troublesome weed in cultivated fields and gardens. It is especially persistent in soils that remain moist much of the time. *WHEN DOES IT BLOOM?* Five-pedaled yellow flowers are borne singly in leaf axils from July to September and open only in sunshine. - *HOW DOES IT SPREAD?* Numerous, tiny, black seeds are produced in...

10COMMON TANSY (714 Views)
*BOTANICAL NAME:* ^Tanacetum vulgare^ *WHERE DID IT COME FROM?* The first records of common tansy are from the ancient greeks who used it for a variety of ailments. Uses for common tansy included: - Repelling mosquitoes, fleas and ticks. - To wrap up meat to keep the flies off. - To help with stomach problems. Because it had so many uses, the governor of Massachusetts listed common tansy as an important plant for colonial herb gardens in the 1600's. This led to wide spread planting of common tansy and the escape of the plant into fields and roadsides. *WHAT DOES IT LOOK LIKE?* Common tansy is a perennial plant whose stems grow in clusters up to 6 feet tall causing the plant to have a bushy appearance. It has small button-like yellow flowers in flat-topped clusters and fern-like leaves which emit a strong odor when crushed. *WHERE DOES IT LIKE TO GROW?* Common tansy likes to grow along...

11DANDELION (371 Views)
*BOTANICAL NAME* ^Taraxacum officinale^ *WHAT DOES IT LOOK LIKE?* A short-lived perennial plant that has a deep, thick tap root that can grow up to 3 feet long. The leaves have jagged edges and hollow, leafless stems ending in a single yellow flower head. All plant parts show a milky white juice if cut. *WHERE DOES IT LIKE TO GROW?* Dandelions are common in lawns, pastures, roadsides, abandoned or unmanaged property. This plant will grow just about anywhere. *WHEN DOES IT BLOOM?* Flowers can develop anytime between March and November. Flowers are quickly followed by fluffy white seed heads. - *HOW DOES IT SPREAD?* New plants come from the root and root segments. Each plant can produce up to 20,000 viable seeds. Each seed has a feathery parachute of soft white hairs that can be easily carried by the wind. *HOW DO I CONTROL IT?* Nothing you can do will totally and permanently get rid of...

12HORSETAILS (625 Views)
*BOTANICAL NAME* ^Equisetum species^ *WHAT DOES IT LOOK LIKE?* Horsetails are among the oldest plants on earth. There are 25 species of horsetails, including annuals and perennials. The most common one in our area, field horsetail, ^Equisetum arvense^ , is a perennial. It ranges in size from 4 inches to 2 feet tall and lookes like miniature pine trees. Scouring rush, ^Equisetum hyemale^ , is also found in our area and is a perennial. Scouring rush appears leafless and will grow 2 to 4 feet tall. Both plants have jointed stems like bamboo. The furrowed stems of horsetails are structurally toughened by silica grains and throughout time were used to scour churns and pans, as fine sandpaper and to polish metal. *WHERE DO THEY LIKE TO GROW?* These plants thrive in many habitats and are at home in wet, poorly drained areas of fields and grasslands; wet meadows; streams and other sites with...

13MOSS (432 Views)
*WHY MOSSES OCCUR?* It is important to understand that mosses occur when some underlying condition allows them to out compete grasses and other plants. Often, moss is a symptom rather than the actual problem. These conditions most frequently are some combination of: - Poorly drained, persistently wet soils - Acidic soil conditions - Medium to dense shade - Repeated “scalping” of turf on uneven terrain - Compacted soils - *HOW TO REDUCE THE COMPETITION FROM MOSS:* If the problems that are limiting the turf or other plant growth are not corrected, any moss elimination or control efforts will be futile. First, identify which of the above factors are likely contributing to the occurrence of the moss. What is your soil pH? If you do not know, then a soil test is required. Next, is the site poorly drained? If so, install drainage or regrade the area to promote water removal. Mosses thrive in...

14MOUSE-EAR CHICKWEED (406 Views)
*BOTANICAL NAME* ^Cerastium fontanum ssp. vulgare^ *WHAT DOES IT LOOK LIKE?* It is a prostrate perennial broadleaf plant that can behave like a biennial or annual in disturbed places. Seedlings grow erect for 2 or 3 inches, then the stem branches, and the plant begins its tufted, creeping growth habit. Mouse-ear chickweed leaves are dark green, elongated, and covered with soft hairs. *WHERE DOES IT GROW?* It is not generally a weed of cultivated crops, because it does not survive tillage. It is common on cultivated land that has been abandoned, as well as in woods, pastures, hay fields, and lawns. Mouse-ear chickweed often persists on bareground and in sidewalk cracks. *WHEN DOES IT BLOOM?* Flowers usually develop from March to August. The small inconspicuous flowers have what appear to be 10 petals, but are really five deeply divided white petals. *HOW DOES IT SPREAD?* Mouse-ear...

15PLANTAINS (422 Views)
*BROADLEAF* ^Plantago major^ *BUCKHORN* ^Plantago lanceolata^ *WHAT DOES IT LOOK LIKE?* Plantain leaves are all basal, in a rosette. Broadleaf plantain has many fibrous roots and the crown is not woolly or hairy. Broadleaf plantain leaves have several prominent, parallel veins and are typically 3 to 7 inches long and 1 to 2 inches wide. Buckhorn plantain has a short, thick taproot with fibrous lateral roots; the crown may be somewhat woolly or hairy. Buckhorn plantain leaves are long (4 to 12 inches) and narrow (up to 1 ½ inches wide) with 3 to 5 obvious parallel veins. Flowers of both are borne in dense clusters at the tip of leafless shoots. *WHERE DOES IT LIKE TO GROW?* Introduced from Europe, both plantains are often found in lawns, gardens, and other disturbed areas such as roadside and pastures. *WHEN DOES IT BLOOM?* The inconspicuous flowers appear soon after the seedling stage...

16PRICKLY LETTUCE (696 Views)
*BOTANICAL NAME* ^Lactuca serriola^ *WHAT DOES IT LOOK LIKE?* It is an annual weed growing from 1 to 5’ in height. The leaves are alternate and prickly on the lower side of the midrib. The plant is sometimes called the compass plant, because the leaves on the main stem are held vertically in a north-south plane, perpendicular to direct sunlight. All parts of the plants emit a milky sap when cut. *WHERE DOES IT GROW?* Prickly lettuce commonly grows in waste areas, gardens, irrigated crops, along road sides, and is a prolific colonizer of disturbed habitats. *WHEN DOES IT BLOOM?* The flowers produced in late spring to early summer are yellow in color and approximately one third of an inch in diameter. *HOW DOES IT SPREAD?* It spreads only by seed. Individual plants can produce from 35 to 2,300 flowers, with each flower head containing an average of 20 seeds. Most seeds are viable and...

17RED SORREL (608 Views)
*BOTANICAL NAME* ^Rumex acetosella^ *WHAT DOES IT LOOK LIKE?* Red sorrel is a perennial weed with distinctive arrowhead-shaped leaves and red flowering stems. The erect stems can grow 1 to 2 feet tall. Both the stems and leaves have a bitter taste, resembling rhubarb. Native Americans used sorrel as an antidote for poison. Common names include: sheep sorrel, horse sorrel, cow sorrel, field sorrel or sour dock. *WHERE DOES IT LIKE TO GROW?* Red sorrel grows in a wide range of soil types, including sandy loam, sand, silt and gravel. It thrives on acid soils with low fertility but is adapted to other soil conditions. It is a weed of disturbed sites, such as roadsides, abandoned fields, gardens, lawns and pastures. *WHEN DOES IT BLOOM?* Male and female flowers are produced on different plants, which bear the flowers in branched clusters at the top of the plant. Yellow-orange male flowers...

18ST. JOHNSWORT (382 Views)
*BOTANICAL NAME* ^Hypericum perforatum^ *NOTE:THIS IS NOT A NOXIOUS WEED! ST. JOHNSWORT IS A WEED OF CONCERN IN KOOTENAI COUNTY* *WHAT DOES IT LOOK LIKE?* A perennial that can grow 1 to 3 feet tall. A mature plant generally consists of one or more woody crowns which are attached to the root system. Large crowns can produce up to 30 erect, reddish, flowering stems yearly. The flowers have five bright yellow petals and deep purple dots along the jagged edges. _The rust colored stems of St. Johnswort can be seen during the winter sticking above the snow._ *WHERE DOES IT LIKE TO GROW?* This agressive weed prefers poor soil and full sun and can be found mostly in meadows, dry pastures, rangelands, roadsides, and empty fields. *WHEN DOES IT BLOOM AND HOW DOES IT SPREAD?* St. Johnswort blooms from May to late September with the peak flowering time in mid to late June. An average plant produces...

19SULFUR CINQUEFOIL (443 Views)
*BOTANICAL NAME:* ^Potentilla recta^ *WHAT DOES IT LOOK LIKE?* A perennial plant with a woody rootstalk. It produces upright stems which can reach 2 to 3 feet tall. The stout, hairy stems end with small clusters of pale yellow flowers. The leaves are somewhat hairy and appear green on the undersides rather than silvery as in many potentilla species. *WHERE DOES IT LIKE TO GROW?* A native of Europe and Asia, this plant likes to live in pastures, logged areas and roadsides. *WHEN DOES IT BLOOM?* The bloom time is from June through July. Each blooming plant can produce as many as 1,650 seeds in one season. Sulfur cinquefoil can also be spread by roots if they are moved by plowing or on soil-moving equipment. - *NON-CHEMICAL* - The use of fertilizer, water and overseeding will encourage desirable grasses and native plants to grow quickly and crowd out this weed. - Hand pulling or digging...

20TUMBLE MUSTARD (703 Views)
*BOTANICAL NAME:* ^Sisymgrium altissimum^ *WHAT DOES IT LOOK LIKE?* Sometimes called Jim Hill mustard, this weedy annual can be found over much of the United States amd Canada. It can grow 2 to 5 feet tall with a thick taproot. A single stem grows from the base leaves (rosette). The tip of the plant is multi-branched and can resemble a shrub. Small flowers with four pale yellow petals form in loose clusters at the tip of the branches. *WHERE DOES IT LIKE TO GROW?* This plant is common in grain fields, rangelands, unmanaged pastures and along roadsides. It likes to grow in any type of soil and in semi-shade or full sun. *WHEN DOES IT BLOOM?* Small, pale yellow flowers begin appearing in June and continue throught the summer. The flowers mature quickly, with relatively few in bloom at one time. - *HOW DOES THIS PLANT SPREAD?* As an annual, tumble mustard reproduces only by seed. Seeds...

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