Field Bindweed - Convolvulus arvensis (sometimes referred to as Wild morning glory) is a stubborn weed pest! Hammer wires or sticks around your garden or flower beds at the start of the growing season. When a bindweed vine pokes out of the ground, twine it around one of the canes. If it is already established in a bed, put the stakes wherever it is first emerging. 

Isolated and small patches of new plants growing on the garden’s borders or away from garden plants can and should come out as soon as you encounter them. Bindweed root systems are stubborn, though, so make sure to remove all rhizomes as well. This is easier said than accomplished unless your soil is quite friable. Mowing can control above-soil growth on your lawn, too. 

If the infestation is new, it can be smothered by black plastic, applied over and beyond the area, weighted down and left for a year.

DO NOT compost this weed. It will just thrive.

If you wish to use a weed killer in addition, be sure to contact your local extension office for caveats and materials. This method is rather the last resort.

A major factor is the porosity of your soil. In a very loose soil, steam can penetrate. Unfortunately, so can the roots of the bindweed. It would definitely set it back seriously. I would have less faith in the hot water, as it is more for relative shallow roots. I battle it in a couple of raised beds, so I use wires to spot it early and dig ruthlessly.