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Weed Identification |
Canada Thistle
Stems: 1-4 ft tall, erect, rigid, branching.- Leaves: sessile, deeply lobed, edged with stiff yellow spines.
- Flowers: many, 1/2-inch flowering heads, male and female flowers borne on different plants. Flowers purple lavender, or white, with overlapping, weakly spine-tipped bracts. Flowers in July and August.
- Seeds: 1/8th-inch long, somewhat flattened, tan, with an apical circle of long hairs.
Canada thistle is a perennial that grows from a deep, complex root system. The roots spread horizontally and send up new stems, forming dense colonies. It grows in a wide range of soils and environmental conditions. It is aggressive, spreading by root and seed. The deep root system makes it difficult to control.
Control: An integrated system must be used for many years to control this pest.
- Biological: Competition with grasses and alfalfa is effective, as are seedhead weevils, and the painted lady butterfly. A three-year intensive cattle grazing program has proved effective in southwestern Colorado.
- Chemical: Fall treatments, combined with mowing, are effective. Get in touch with you local weed control office for the latest information on controlling this pest.
- Mechanical: Mowing can be effective, if combined with herbicide application. Plowing increases plant numbers and should be avoided.
Source: USDA Forest Service
Contact Information
General contact information for the Butte-Silver Bow Courthouse.
Postal address:
155 West Granite Street
Butte, MT 59701
Telephone: (406) 497-6200
FAX: (406) 497-6328
Chief Executive Paul Babb
The governments of the city of Butte and Silver Bow County combined in 1977. The government is lead by the Chief Executive, Paul Babb and a 12-member Council of Commissioners.
Our business hours are Monday through Friday, 8:00 a.m. through 5:00 p.m. MDT, with no noon closure. Business offices are closed for State and Federal holidays.
Essential Public Works Services, (water, sewer, and road maintenance) are available 24 hours, seven days a week.
- To report a water problem, dial 497-6540;
- A sewer problem, 497-6550;
- A road maintenance or animal control problem, 497-6565
The function of the Butte-Silver Bow Government is to serve the citizens of the city of Butte and Silver Bow County. Our government's goal is to improve and maintain governmental operations and conditions within the boundaries of Silver Bow County.