You plant something pretty, it grows beautifully, and a year or two later your neighbour is knocking on the door to politely ask why it’s now coming up in their lawn. Plants don’t read property deeds. Some of the most popular garden choices spread through underground stems, runners or climbing growth, and they cheerfully cross a fence or a boundary wall without so much as a pause. A few can even become a serious headache between neighbours. Here are seven plants known for crossing the line, along with what you can do to keep them where they belong.
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