Mulch

Mulch

Garden pruning's and green waste collected from verges and dropped off at the Armadale Landfill and Recycling Facility and Roleystone Greenwaste Site is mulched several times per year and offered to the public.

Self-Loaded Mulch

Mulch can be self-loaded between 9am and 4pm at NO CHARGE at Armadale Landfill and Recycling Facility. Mulch can be obtained on weekends from Roleystone Greenwaste Site during opening hours.

Machine Loaded Mulch

Mulch can be loaded for a fee at Armadale Landfill and Recycling Facility between 9am to 4pm. You will need to weigh your vehicle in at the weighbridge and weigh out again for the tonnage rate to be applied.

Method to Sterilise Mulch

The mulch is not sterilised and may contain weed seeds that can germinate in your garden. Therefore the following is recommended:

Composting is one method of killing weeds and seeds in mulch and can be done very simply just by following the procedures set out below:

  • Heap your compost material into as high a pile as possible and thoroughly wet down.
  • Leave to stand overnight.
  • Once the mulch is completely soaked through, add approximately 100g Nitrogen per cubic metre of mulch to help accelerate composting. (Nitrogen may be in the form of ammonium nitrate, urea or some other source of high nitrogen fertiliser. The reason for this is to maintain the correct Carbon / Nitrogen ratio. For efficient decomposition of organic material, a Carbon / Nitrogen ratio of approximately 14:1 should be maintained.)
  • Add approximately one handful of dolomite lime per cubic metre as this is beneficial and will help to maintain a relatively neutral pH level.
  • Water the lime and nitrogen fertiliser into the pile and leave to stand.
  • Monitor the temperature of the mulch heap with a thermometer. To pasteurise the mixture, a temperature of at least 68 degrees Celsius should be maintained for a minimum of 36 hours.
  • If possible, turn the compost with a fork to aerate the mixture while continuing to monitor the mulch temperature.
  • Make sure the mix is kept consistently moist.
  • Once the temperature begins to fall, the composting process will be complete and the material will then be ready for use in your garden.

Note 1

This method of composting only pasteurises the mulch. Micro-organisms, such as bacteria and fungi will be present in mix. However, if the suggested temperature levels are reached, most of the harmful organisms will be destroyed, while the beneficial organisms will be retained. This method should also kill most weed seeds.

Note 2

The above process works best for heaps of approximately 3 cubic metres. Smaller piles would need to be covered with black plastic to achieve the required temperature for sterilisation.

The City also sells compost bins with free delivery.