Applying proper herbicides in the late winter and early spring is a good first approach. Healthy smother crops like turf and other dense grasses can prevent Morning Glory Weed from growing, as can proper shade and watering. Remember, the healthier your lawn is, the less likely you are to see signs of any weeds at all.

Morning glories do best in soil that is moist but well-draining. A neutral soil pH of 6.0 to 6.8 is best, but morning glories will grow just about anywhere. However, they do bloom better in soil that is not too rich in organic matter. You can always amend the soil later if the vines look like they are struggling.

It is very difficult to kill morning glory and you need to be vigilant over a long period to completely eradicate it. As you have found, just spraying something like Roundup probably won't work.

Care of Morning Glory Plants In fact, once established they require little attention. Ideally, the soil should be moist, but not wet. Water them during dry periods, once or twice per week. Container plants may require additional watering, especially in warmer regions.