What is a weed?
the definition of a weed is a plant which grows out of place. a beautiful tulip would be a weed if it grew in a wheat field and the same wheat would be a weed if it grew in a tulip field.zaf.
Almost all weeds fall into the category - environmental weeds. The worst weeds are the ones that spread rapidly, have particularly opportunistic characteristics and are difficult to remove once established. Opportunistic weeds that are established often drop thousands of seeds. Weed seeds are spread by animals and the weather.