The invasive weeds threatening Nevada come from neighboring infested states but they originated in Europe or Asia. In their native ecosystems these weeds are held in check by competing plants, diseases, and natural predators. They review troublesome plants and determine whether or not a particular plant should be declared noxious. Weeds on the state's noxious weed list are to be controlled on private and public land. If they are not, then the NDOA can treat them and bill the property owner for the costs incurred.
Many invasive weeds are also on the state's noxious weed list.
Weeds can be added to the state's list by petitioning NDOA and explaining why a particular plant should be considered noxious. They are able to compete very effectively with cultivated and native plant species for sunlight, water, and nutrients. They are highly adaptable and have few natural competitors. Exotic - Most are not native to Nevada, they have been introduced. Highly aggressive - They are able to displace native species, even in undisturbed sites because they can flourish in a wide variety of habitats and often alter the habitats they invade.