Best option for disposal:
Small quantities (two litres maximum) can go in your green garden waste bin.
Remove any
packaging, tags and twine first.
Otherwise:
Large quantities of potting mix, soil and dirt can be disposed of at the Drysdale Resource Recovery Centre. Charges apply.
Excess soil, potting mix or dirt may also be of use to members of your local community. Try offering through online groups or ask at your local neighbourhood house or shed.