Answer: Morning glories can be either annual or perennial, depending upon your weather. As you have found, they reseed readily and that's what I think you're dealing with. Not only do the roots remain alive but seeds from previous year's plantings are hiding in the soil. The easiest approach is to place cardboard, thick mulch or even weed barrier on the soil around the desireable plants to keep others from sprouting and overtaking the area. To prevent the problem in the future, cut off the spent flowers before they set seeds. Best wishes with your garden!
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