The answer to 'why is my fence invasive plants' is that invasive plants can often spread and grow along fence lines. Weeds, vines, and other aggressive plants may take advantage of the soil, light, and structure provided by your fence to establish and spread. This can be caused by improper fence installation, lack of maintenance, or the natural spread of invasive species in your area.
Some common symptoms include plants growing up the fence, weeds spreading along the base, or vines and creepers entwining the fence posts and rails. To address this, you'll need to regularly inspect your fence and remove any invasive plants you find. This may require digging out roots, cutting back growth, and using herbicides in some cases. If the problem persists or you have a severe infestation, it's best to consult a professional landscaper who can properly identify and treat the issue.