Commonly seen vining throughout the southeastern United States, the perennial kudzu originally hails from Asia. Although the United States Department of Agriculture believes that kudzu spreads up to 150,000 acres annually, the Forest Service estimates that the weed spreads by 2,500 acres per year. Regardless, kudzu can cover anything in its way, from trees, fences, and other permanent structures.
Some people use weed as slang for Marijuana but these two are different in terms of their growth process.
A weed in a general sense is a plant that is considered by the user of the term to be a nuisance. The word is normally applied to unwanted plants in human-controlled settings, especially farm fields and gardens, but also lawns, parks, woods, and other areas.
Marijuana is actually a colloquial name for the cannabis plant. It is a plant, and it’s specifically a genus of the flowering plant family, Cannabaceae. So, biologically, marijuana is actually a flower.