Shop Powder NPK Fertilizer: Balanced Nutrients for Lush Growth, Roots & Blooms
Discover Complete Grow’s full range of premium NPK fertilisers — expertly formulated for strong root systems, leafy green growth, and vibrant flowers or fruit. Whether you’re feeding veggies, herbs, houseplants, or citrus trees, NPK fertilisers are your garden’s foundation.
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Our NPK fertilisers contain the three essential macronutrients — Nitrogen (N), Phosphorus (P), and Potassium (K) — in balanced ratios to support every stage of plant growth. From general-purpose 20‑20‑20 to high-phosphorus blends like 4‑18‑38, we’ve got the exact formula your plants need.
NPK fertilisers are perfect for:
- Strong, healthy root development
- Faster vegetative and flowering growth
- Fruiting plants, flowers, herbs & citrus
- Hydroponic systems and soil-based gardens
Whether you’re growing in pots, raised beds, or nutrient film systems, Complete Grow’s NPK range delivers clean, reliable results — trusted by home gardeners and commercial growers across Australia.
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- Select options This product has multiple variants. The options may be chosen on the product page
The Best NPK Fertiliser for Every Plant – Liquid, Dry, Hydro, Citrus & More
Explore Complete Grow’s industry-trusted collection of NPK fertilisers — made for high-performance growth and tailored feeding. Whether you’re fertilising flowering vegetables, citrus trees, or leafy herbs, our balanced nutrient blends are ideal for beginners and experts alike.
Choose from liquid or powdered NPK fertilisers in formulas like 20‑20‑20 for general use, 4‑18‑38 for fruiting plants, or mixes with added CalMag for hydroponics and fast-growing species. These fertilisers dissolve quickly, absorb efficiently, and store well.
What Is NPK Fertiliser & Why Use It?
NPK fertiliser delivers the three primary nutrients your plants rely on:
- Nitrogen (N) – boosts leaf and stem growth
- Phosphorus (P) – supports roots, flowers, and fruiting
- Potassium (K) – builds resilience, boosts colour, and improves yields
Each plant has different nutrient needs depending on its growth stage. A balanced NPK mix ensures complete feeding from root to flower — ideal for soil, pots, or hydroponics.
Why Powdered NPK Fertiliser is So Effective
Our powdered NPK fertilisers include the essential macronutrients every plant needs:
- Nitrogen (N) for leafy, green growth
- Phosphorus (P) for deep roots and abundant flowering
- Potassium (K) for plant strength, fruiting, and disease resistance
Blends like NPK 4‑18‑38 + CalMag are popular with hydroponic growers and anyone needing precise nutrient ratios. For general-purpose use, our balanced powdered fertiliser is perfect for vegetables, herbs, and houseplants alike.
Each formula includes trace elements like calcium, magnesium, and iron — ensuring every plant receives a full spectrum of nutrients.
How to Use Powdered Fertiliser
Powdered fertilisers are dissolved in water and applied just like a liquid feed.
Use every 1 to 2 weeks for most plants during the growing season. You can also add smaller doses more frequently for delicate or high-demand plants.
When using powdered nitrogen fertilizer, calmag, or high-phosphorus blends, always follow dilution rates. Over-concentration can lead to burning or salt buildup — but when used correctly, powdered fertiliser is one of the most cost-effective, powerful plant food options available.