A weed is any plant that grows where it is not wanted, usually in competition with cultivated plants or in disturbed habitats. Weeds are often characterized by their rapid growth, high reproductive capacity, and adaptability to various environmental conditions. Some weeds can also be invasive, meaning they can displace native species and reduce biodiversity. However, the distinction between weeds and desirable plants is often subjective and context-dependent, and some plants that are considered weeds in one situation may be valued in another.