The answer to 'why is my stone walkway invasive plants' is that weeds and other unwanted vegetation can easily take root and grow between the stones of your walkway. This is a common issue with stone or paver walkways, as the gaps and crevices provide an ideal environment for invasive plants to establish themselves.
Some common causes include lack of proper edging or containment around the walkway, inadequate weed control measures, and soil or organic matter buildup in the gaps. Over time, these conditions allow weeds, grasses, and other unwanted plants to spread and take hold, disrupting the appearance and function of your stone walkway.