The Strategy - Field Bindweed (Convolvulus arvensis) is another of these perennial plants with a creeping root system (rhizomes). This plant from Asia tends to climb other plants, fences, or equipment, and otherwise it creeps across the ground. This plant is wrongly called ‘morning glory’ . It has white to pink flowers that are funnel shaped. Leaves are arrowhead shaped ˝ inch to 2 inches long.
The Attack - This plant’s seed can last in the soil longer than most any plant, which makes it one of the most troublesome plants in agriculture. Add this to the creeping root system and you have the toughest weed to control in agriculture and lawn and garden. Compound this with it lack of forage value and it ability to spread by seed and roots it is easy to see why it is one of our listed noxious weeds.
The Defense - As with most plants that are rhizomatous control is very difficult and mechanical efforts are normally useless. Keeping constant competition to this plant is key to controlling it. Numerous times I have recommended to people that they actually move their garden to another area on their property and plant grass in the garden area. Then use herbicides to control the field bindweed until the seeds have all germinated. Herbicides such as 2,4-D for lawns work okay but in agriculture and pastures products with dicamba or picloram work best. Non-crop use Method (Bayer), one of the best I have ever seen. Fall is a great time to control this weed. Once Idaho has a killing frost (28 degrees or less) the plant sends all nutrients to the vast root system and using the right herbicide will move into the roots deeper thus better control. Don’t give up.
U of I Idaho's Noxious Weeds Control Guidelines (183 KB PDF download)