Many people cannot believe their garden plants can be the culprits, yet the vast majority of weeds in Australia began in urban gardens. Weeds, too, have a dollar value. The cost of environmental damage could be just as large, although it is impossible to put a price on the loss of native forests, flora and fauna. Weed invasion is one of the most serious and expensive land degradation problems in Australia. And then there are the health costs.
Weeds cause health problems for both humans and livestock.
Parthenium, for example, can cause severe allergies, asthma and dermatitis. If you live close to State forest or bushland, be careful when buying plants. Seek advice on what species are problems in your area. Different plants are problems in different areas. Better still, join Weedbusters in October.