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Grassmaster Lawn Fertiliser 25 kg (Terra Firma)


Highly recommended! Grassmaster Lawn fertiliser by Terra Firma combines fast acting NPK fertiliser with natural slower acting sources of nutrients such as Blood & Bone, Fish Meal, Seaweed extract & composted Poultry Manure.

Grassmaster Lawn fertiliser 25 kg by Terra Firma. Highly Recommended!

The highest organics analysis in any grass fertiliser combined with a high NPK. Formulated with specially coated high analysis Urea and DAP to complex and stabilise the vital growth nutrients often lost through leaching or volatilisation (the loss of nitrogen to the atmosphere as ammonia gas), giving extended nitrogen and phosphorus protection and release which means less fertilising with greener more manageable growth over a longer period. The ONLY organic complete grass fertiliser with 4% Calcium for soil balance and plant health.

Calcium helps alleviate the acidifying effects of soluble fertiliser nutrients. Healthy turf requires good trace element levels BUT don’t pay for extra iron if you don’t need it! Most soils are rich in iron however it is often unavailable to plants especially if complexed with soluble P. The high percentage organics in Grassmaster®, includes humic acid, a natural material that helps release iron and phosphorus from the soil for easier plant uptake. Click Here for a PDF on Grassmaster.

Granules Include:

  • 4mm Granules for easy spreading.
  • Terra Firma’s Poultry Manure Base.
  • Black Urea ® & Black DAP™.
  • Sulphate of Potash.
  • Green Cal - (Natural Gypsym).
Application Rates:


Apply 50-100g of Grassmaster evenly per square metre of lawn every 3 months and water in well. For larger lawns apply 5-10kg per 100 square metres.


Consider an application of Terra Firma’s Lime Impact a couple of weeks before planting. Spread up to 100g per square metre & rake into soil before sowing the seeds, laying turf or planting runners. For large lawns apply up to 10kg per 100 square metres.


Fruit Trees: 100-500g, lifting the rate to the higher range if the trees are established.

Vegetable Beds & Flowers: 75-100g per square metre.

Plants & Shrubs: 30-50g per shrub. Roses & Shrubs - 100g per sq metre.

Azaleas, Native & Acid Loving Plants - 50g per sq metre.

Product Analysis:

Nitrogen (N) 10.50% Iron (Fe) 2000mg/kg, Phosphorus (P) 2.00% Manganese (Mn) 240mg/kg
Potassium (K) 8.00% Copper (Cu) 50mg/kg, Sulphur (S) 5.73% Zinc (Zn) 200mg/kg
Calcium (Ca) 4.00% Boron (B) 15mg/kg, Magnesium (Mg) 0.95% Molybdenum (Mo) 5mg/kg
Silicon (Si) 116mg/kg Cobalt 2mg/kg, Carbon 18.00%.

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