Vermicast (Worm Castings)

Benefits of Vermicast

In the Soil:

  • Adds stable and mature humus
  • Increases soil organic matter (SOM)
  • Increases water holding capacity
  • Improves soil structure and promotes stable soil aggregates
  • Increases nutrient holding capacity (high cation exchange capacity)
  • Buffers soil pH
  • Adds natural plant growth bio-stimulants and enzymes
  • Unlocks plant nutrients like Phosphate
  • Adds beneficial soil organisms: fungi, mycorrhiza, bacteria, nematodes
  • Adds earthworm capsules (eggs)

In the Plant:

  • Stimulates plant root growth and root activity
  • Increases nutrient uptake
  • Increases yields, flowers and fruit size
  • Improves fruit quality and shelf life
  • Suppresses plant diseases: phytophthora, mildew, others
  • Reduces root-damaging nematodes
  • Strengthens plants against insect attack: aphids, caterpillars
  • Encourages pollinating insects

For the Environment:

  • A natural product – no chemicals or fertilisers are applied
  • Reduces the need for and loss of fertilisers
  • Protects groundwater
  • Reduces soil erosion
  • Promotes carbon sequestration
  • Reduces compaction risk
  • Aerates soil
  • Reduces undesirable gaseous losses from soil (NH3 and N2O)

Typical Nutritional Values

Organic Matter 30.5%
Total Nitrogen 1.0%
Total Phosphorus 6,480 mg/kg
Total Sulphur 2,510 mg/kg
Total Potassium 1,710 mg/kg
Total Magnesium 2,400 mg/kg
Total Calcium 98,400 mg/kg
Total Sodium 1,500 mg/kg
pH 6.8 – 7.1 (neutral)
C/N Ratio 15
Active Bacteria High
Active Fungi High

How to Use Vermicast

  • Potting mix: mix up to 20% of Vermicast with potting mix before planting.
  • Garden beds: mix up to 20% of Vermicast with soil before planting.
  • Transplanting: use one handful of Vermicast per plant when transplanting to garden beds. Mix gently with loose soil before planting.
  • Existing plants: sprinkle one handful of Vermicast around the root zone of each plant and gently mix into the top 1-2 cm of soil.
  • New lawns: mix 5 litres per m2 (5 mm) of Vermicast into the top 5 cm of soil during bed preparation.
  • Maintaining lawns: spread 2 litres per m2 (2 mm) of Vermicast after mowing.
  • Vermicast can be mixed with fertilisers and lime.
  • Share Vermicast with your neighbour so you can enjoy healthy gardens on both sides of your fence.