1.   But if there are patches where it is possible to survive, some faster-growing species like pest plants and bacteria can hang in there for ages.

2.   Paradoxically, fire also helps the spread of some noxious pest plants, such as the melaleuca tree.

3.   The plant is classified as an exotic pest plant.

4.   The state of Florida and the city of Tallahassee are using small herds of sheep to control invasive pest plants.