Price range: $39.90 through $387.00
Complete 3-part nutrient system for flowering & fruiting plants
✅ High-phosphorus NPK 4-18-38 for powerful blooms and heavy fruit set.
✅ With Calcium & Magnesium for firmer, tastier, more colourful fruit.
✅ Balanced for hydroponics & soil — steady feeding at every stage.
✅ Boosts yield, flavour & bloom density across all fruiting plants.
A complete, high-performance nutrient system for vegetables, herbs, and leafy greens. This three-part formula provides all essential macro and micronutrients required throughout every stage of plant growth — from seedling to harvest.
Suitable for both hydroponic and soil-based growing.
| Nutrient | Percentage (%) |
|---|---|
| Total Nitrogen (N) | 4% |
| Phosphate (P₂O₅) | 18% |
| Potash (K₂O) | 38% |
Each component is designed to work together for healthy, productive plants.
Feeding instructions and mixing ratios are clearly listed on the package.
I have switch from the seasol fertiliser i was using, to this advanced fruiting fertiliser and the results have been great my tomato produced alot more fruit this year with healither growth. Has been very good will continue to use
my third time buying this product so obviously I love it, my hydroponic tomatoes are thriving on this nutrient, I can't recommend it highly enough, fast delivery too
Higher P and K to drive budding, flowering and fruit quality while keeping foliage compact.
The 4-18-38 profile prioritises phosphorus and potassium. Phosphorus supports stronger roots and abundant flower initiation, while potassium drives colour, flavour and overall resilience. The modest nitrogen helps prevent stretch, directing energy into blossoms and fruit load. With added Calcium Nitrate and Magnesium Sulphate, plants also receive structural strength, resistance to tip burn, and improved chlorophyll activity.
Choose a recipe (per 10 L), enter litres — we’ll calculate grams for each component.
I have switch from the seasol fertiliser i was using, to this advanced fruiting fertiliser and the results have been great my tomato produced alot more fruit this year with healither growth. Has been very good will continue to use
my third time buying this product so obviously I love it, my hydroponic tomatoes are thriving on this nutrient, I can't recommend it highly enough, fast delivery too
Verified Buyer
Verified Buyer
You get three essential components that deliver complete nutrition for flowering and fruiting plants:
✔️ NPK 4-18-38 — High phosphorus and potassium for strong flowering, fruit set, and colour.
✔️ Calcium Nitrate — Builds firm fruit, prevents blossom end rot, and supports growth.
✔️ Magnesium Sulphate — Boosts chlorophyll, nutrient uptake, and overall plant health.
Fertilisers with a higher K value in the NPK ratio are considered high in potassium. Examples include NPK 4-18-38, 13-13-36, or 0-0-50, which deliver concentrated potassium to enhance fruiting, colour, and flavour.
At CompleteGrow, our NPK 4-18-38 + Calcium & Magnesium is a professional-grade high-potassium fertiliser designed for fruiting and flowering plants. It improves sweetness, firmness, and resilience across a wide range of crops — including tomatoes, peppers, citrus, and berries.
High-phosphorus and high-potassium fertilisers like NPK 4-18-38 combine the two most important bloom nutrients — phosphorus (P) for root and flower formation, and potassium (K) for fruit size, quality, and colour.
This balanced blend provides full bloom support, making it ideal for plants that need energy for flowering and fruit set, such as tomatoes, strawberries, capsicums, and citrus trees.
For Australian growers, CompleteGrow NPK 4-18-38 + Calcium & Magnesium is one of the best high-potassium fertilisers available. It’s crafted for consistent results in hydroponic and soil-based systems, ensuring improved fruit yield, colour development, and disease resistance across all major crops.
High-phosphorus fertilisers have a larger middle number in their NPK ratio — such as NPK 4-18-38, 10-52-10, or 10-30-20.
These blends encourage root growth, early flowering, and strong bud formation, making them ideal for fruiting and flowering plants.
For Australian growers, CompleteGrow NPK 4-18-38 + Calcium & Magnesium is a professional-grade fertiliser high in phosphorus and potassium, delivering powerful bloom and fruit performance.
Fruit trees require a fertiliser rich in phosphorus (P) and potassium (K) to support flowering, fruit set, and sweetness.
A formula such as NPK 4-18-38 provides the ideal nutrient balance for strong root systems and heavy fruit production, while helping prevent leaf drop and poor fruit colour.
When enhanced with Calcium & Magnesium, this blend offers professional-grade performance for citrus, mango, avocado, and stone-fruit trees — suitable for both hydroponic and soil-based growing systems.
