 29% originated from garden waste.Of a population of Heracleum mantegazzianum, 18% was found by Schepker to be generated by garden waste (as cited by Kowarik & von der Lippe, 2008) pg 24–25.An Australia government publication suggest that some of the main reasons for the dumping of garden waste can be attributed to lack of care for the environment, convenience, or a reluctance to pay for the correct collection or disposal of the waste.