Blackberry Blackberry is an invasive shrub that are a threat to agriculture due to its rapid growth and spread.
Chilean Needle Grass (Nassella neesiana) Chilean Needle Grass is a Weed of National Significance and poses a major threat to agriculture and native ecosystems. The sharp seeds can injure livestock and contaminate wool, and the grass can outcompete native species, reducing pasture productivity.
St John's Wort (Hypericum perforatum) St John’s wort is a long-lived perennial herb growing to about 80 cm in height.