Noxious weeds are invasive plant species that can harm agricultural crops, natural ecosystems, and human health. They often grow rapidly, outcompeting native plants for resources like sunlight, water, and nutrients. This can lead to reduced biodiversity and negatively impact local wildlife. Controlling noxious weeds is essential for maintaining healthy environments. Methods include mechanical removal, chemical herbicides, and promoting the growth of native plants. Many regions have specific lists of noxious weeds to help landowners identify and manage these harmful species effectively.