Larimer County Weed District Identification and Management of Field Bindweed (Convolvulus arvensis)
					Field bindweed (Convolvulus arvensis) is a deep-rooted perennial with the ability to form dense mats of vegetation. This weed is native to Europe and is particularly troublesome in cultivated fields.Field bindweed is one of the most difficult weeds to eradicate due to the long seed viability and extensive root system. Successful mechnical control is, in general, only successful for small populations and requires considerable labor. If handpulling, it is best to remove only the above-ground portion of the weed, thus reducing soil disturbance. Research has shown that subsequent handpullings will need to occur every 7 to 10 days following emergence of bindweed from the soil. Depending on how long the weed has been there, this process may need to be repeated for many years. Selective control (broadleaf plants are not harmed) can be achieved with herbicides containing dicamba (Banvel, Veteran 720), picloram (Tordon), Campaign, and Prompt 5L. Non-selective control (all contacted vegetation is affected) can be achieved with glyphosate products such as Rattler, Razor, Roundup, Credit, and Rodeo for aquatic sites. See label for specific rates and timing of application. However, these herbicides, in general, are applied when the plant is actively growing; preferably when the plants are in the early bud stage. It is also recommended to use a surfactant, such as dishsoap (1-2 ounces/gallon), when applying these herbicides. Some observational data indicates that growing pumpkins can help to reduce the competitiveness of bindweed. Also, the Colorado Department of Agriculture's insectary has biological control agents for bindweed. They can be reached in Palisade at 970-464-7916.
	The picture above depicts the arrow-shaped leaves and pink flowers (these ones happen to be closed) of field bindweed. Flowers typically are trumpet-shaped and can also be white, pinkish, or lavendar. Seeds remain viable for up to 50 years. Flowering occurs from late June until frost in the fall. The picture below shows field bindweed strangling a dead ponderosa pine at Boyd Lake State Park. Field bindweed is highly effective at outcompeting natives for resources.

Top of Page

Back

Back to Weed District Home

Back to Parks & Open Lands Home