Invasive weeds threaten natural ecosystems by displacing native species. When weeds displace native plants, animals are left without their natural homes and food. Consequently managing weeds is an important part of land management and ecological restoration and all visitors to Dirk Hartog Island are encouraged to make sure their vehicles, trailers, boats and equipment are clean and free from soil, weeds and other potential pests.

The Dirk Hartog Island Weed Management Plan recommends the following management of weed species on Dirk Hartog Island:

Weeds to Eradicate

Couch, Cynodon dactylon 

Castor oil plant, Ricinus communis

Japanese pepper, Schinus terebinthifolius

Lupin Lupinus cosentinii

Wild Radish, Raphanus raphanistrum

Weeds to Control

Ice plant, Mesembryanthemum crystallinum

Fourleaf allseed, Polycarpon tetraphyllum

False sowthistle, Reichardia tingitana

Weeds to Prevent

‘High risk alert species’ have been recorded in Shark Bay but are not currently known on Dirk Hartog Island. It is important that any sightings of these species on the island are reported so they can be checked and dealt with promptly.

Ruby dock, Acetosa vesicaria

Kapok bush, Aerva javanica

Mexican poppy, Argemone ochroleuca

African boxthorn, Lycium ferocissimum

Crownbeard, Verbesina encelioides