Is there a non-toxic recipe to kill morning glory?

Well, anything you use to kill it is certainly toxic to the morning glory. Seriously, though, this can be a difficult weed as well as a pretty vine. Pulling the vines, cutting them back, and cultivating may eventually weaken the roots and the plant will expire. One problem with the morning glory is that new vines will readily sprout from seeds dropped as the vine blossoms. Even in areas where the vine is killed by frost, there are enough seeds to keep a patch growing for years. If you tire of pulling and cultivating, consider the use of a weed killer that is applied to the foliage, such as Glyphosate. Glyphosate will usually kill any plant you put it on, so exercise care around plants you want to keep. This chemical does not remain in the soil after you apply it. It breaks down very quickly. As with any chemical, read and follow all label directions and exercise common sense caution in use and storage. Your cooperative extension office can often check for any recent research tailored to your location. What some consider a noxious weed is a pretty flower to others. After all, poison ivy is a gourmet banquet to a billy goat.