List of invasive plant species in the Northern Territory

Numerous plants have been introduced to the Northern Territory of Australia since colonisation began in the 1860s. Many have become invasive species or noxious weeds which by definition compete with native plants and suppress the growth of indigenous populations of both plants and animals.

A weed is broadly considered to be a plant that requires some form of action to reduce its negative effects on the economy, the environment and human health or amenity. XXX weeds are declared under legislative controls to reduce their impacts.

Weed classification
The Weeds Management Act 2001 defines three classes of weeds:


 * Class A: to be eradicated
 * Class B: control, growth and spread to be prevented
 * Class C: prevent entry, not to be introduced into the Northern Territory

All class A and class B weeds are also included as class C weeds.