Answer: I would start by cutting down on your side of the property line to sever the roots of any invading plants. Dig those that are established on your side of the property line. This should stop some of the growth from the neighboring property. Rose of Sharon can spread by seeds so spreading a granular pre emergent herbicide in the area, including your lawn should stop future invasion. Pre emergence products work by keeping seeds from germinating so any seeds from the neighboring plants that blow onto your property won't sprout. I think your first priority is digging and pulling the existing plants out and then using a pre emergence product, then periodically cutting into the ground a full shovel's depth at the property line to sever any invading roots should keep the Rose of Sharon in your neighbor's property instead of yours. Good luck with your project.
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