The total current annual cost of weeds in NSW is estimated to be in the range from $1,671 million to $1,903 million per annum. This cost is not restricted to lost agricultural production but includes irreparable degradation of natural resources (including vegetation), threaten ecosystem biodiversity values and interfere with human health and recreational activities. Strathfield Council considers noxious weed management to be an integral part of managing natural resources and protecting environmentally significant areas.
Ultimately through displacing native vegetation and invading streams, entire ecosystem functions may be adversely affected including changed faunal habitats. In extreme cases, weeds threaten the status of nationally or internationally significant areas and human health.