Description
TRIPLE BOOST Fertiliser 20L is a liquid NPK fertiliser containing nitrogen, phosphorus and potassium, in the bulk drum. This is the trade pack – built for people applying through a boom or a large sprayer across an area, not a watering can across a bed.
Why the 20L
At $189.20 the drum works out at $9.46 per litre, against $17.60 per litre in the 1L bottle – a saving of just under half. For turf contractors, landscapers, growers and acreage owners running a regular feeding program, the drum is the only size that makes economic sense.
If you are feeding a suburban block, the 5L will almost certainly suit you better. Liquid fertiliser is best used within its shelf life, and 20 litres is a lot to work through on one lawn.
What it does
Nitrogen drives leaf and shoot growth. Phosphorus supports root development, flowering and fruit set. Potassium goes to overall plant hardiness. As a liquid it goes into solution cleanly and is taken up without waiting on soil moisture to break down a granule.
Suitable for turf, pasture, horticulture and large-scale ornamental plantings. Always follow the dilution rate on the label.
Which size do you need?
| 1L | $17.60 | $17.60 per litre | Pots, beds, small lawns |
| 5L | $60.50 | $12.10 per litre | Whole-property feeding, small commercial |
| 20L – this pack | $189.20 | $9.46 per litre | Trade, turf contractors, acreage |
Buying for a contract or a property portfolio? Call us about trade pricing and freight – Garden Nursery Products has supplied Australian growers and turf managers since 1979.
Application Rates
Shake or Stir Well Before Use.
Boost Your Plants: Add a small dash when watering.
Mixing Instructions:
- Spraying: Mix 2 teaspoons (10mL) per litre of water and spray on plants.
- Watering Can: Add 4 capfuls (90mL) to a 9L watering can and water plants.
- Transplanting: Soak plants or seeds in 2 teaspoons (10mL) per litre of water before planting.
- Hose Application: Pour 500mL into a 2L hose-end sprayer, fill with water, and spray over the garden.
For Best Results: Apply every 2 weeks in the cool part of the day.
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Frequently asked questions
What do the three numbers on a fertiliser bag mean?
They are the N-P-K ratio - the percentage by weight of nitrogen (N), phosphorus (P) and potassium (K). Nitrogen drives leaf growth and colour, phosphorus supports roots and establishment, and potassium builds stress and disease tolerance. A blend like 15-4-12 is 15% N, 4% P and 12% K, which suits an established lawn; a higher-phosphorus starter blend suits new turf.
What is the difference between slow-release and fast-release fertiliser?
Fast-release (soluble) fertilisers green the lawn within days but are used up in a few weeks and can burn if over-applied in heat. Slow-release fertilisers feed steadily over 8 to 12 weeks or more, give even growth and are far more forgiving in summer. Many turf managers use slow-release as the base feed and a light liquid feed for a quick colour lift.
How much fertiliser does my lawn need?
Granular turf fertilisers are typically applied at 2.5 to 5 kg per 100 square metres, so a 500 square metre lawn needs roughly 12.5 to 25 kg - about one standard bag per application. Spread it evenly with a spreader and water in straight away. Always follow the rate on the bag, as concentrated blends are applied at lower rates than general-purpose ones.
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