In 2014, the morning glories nearly took over the garden. OK, so I planted a few myself for color… I never thought they would be that aggressive. Lesson learned. Pretty, though.
Bottom line: just keep ’em reigned in. Once they get their tendrils going, they’re hard to pull out without damaging their victim as well. Still, I don’t mind them in a few places– they work nicely wrapping themselves up the railing leading up to the front door… but in those ones, I keep in pots.