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Reviews

5.0 Based on 7 reviews
Laura K.

Plants look stronger

"Noticed stronger stems and healthier leaves after using this. Works well with my setup."

Page 1 of 7

Cal-Mag Hydroponic Nutrients Fertiliser

Price range: $36.00 through $46.70

High-strength CAL-MAG for fast-growing, heavy-feeding plants.

✅ Chelated Calcium & Magnesium for rapid absorption
✅ Helps prevent blossom end rot, tip burn & stunted growth
✅ Double the strength of standard Cal-Mag formulas
✅ Used by commercial hydroponic growers

CompleteGrow 1L fertiliser sprayer
Recommended add-on Save $5.10

1L Fertiliser Sprayer

Made for CompleteGrow nutrients. Apply feeding more evenly with less mess across your garden.

Guided mixing Copper hose fitting
Please select a fertiliser amount first.
Bundle price
$45.00 $39.90

Australian Owned & Manufactured

Free Shipping
Limited Time

Boost Plant Growth

CAL – MAG

NPK 4-0-0

Our Complete Grow CAL-MAG is made from a special blend of chelates and mineral nutrients for effective and fast absorption by plants.

Analysis

  • 🧪 Calcium – 6%
  • 🧪 Magnesium – 2%
  • 🧪 Iron EDTA – 0.1%
  • 🌿 Plus all trace minerals

Complete Grow Cal-Mag is a concentrated Chelated Calcium and Magnesium solution which improves the overall health of the plants. It assists fast-growing and heavy-feeding plants to uptake the required nutrients. It also helps prevent blossom end rot, tip burn, poor setting, and stunted growth.

Double the strength of other Cal-Mag products. Made and used by commercial hydroponic farmers using high-grade chelated fertiliser.

Direction

Apply 0.5 to 1ml per litre of water. Can be used in both grow and flower stages.

Reviews

5.0 Based on 7 reviews
Laura K.

Plants look stronger

"Noticed stronger stems and healthier leaves after using this. Works well with my setup."

Chris A. Verified Buyer

Good addition to feeding routine

"Added this alongside my normal nutrients and it’s made a noticeable difference in plant strength."

Paul N. Verified Buyer

Noticeable difference

Stems feel stronger and leaves look better. Works well with the rest of my setup.

Page 1 of 3

Best For These Plants​

Prevents Blossom End Rot & Tip Burn
Supports Strong Growth & Nutrient Uptake

How it Works

Mix 0.5–1ml per litre of water
Feed Your Plants
Watch Them Thrive
Cal-Mag deficiency signs

What Cal-Mag Deficiency Looks Like

These symptoms may appear when plants cannot access enough calcium or magnesium. A Cal-Mag supplement can help correct a genuine deficiency, but check pH, root health and watering first—each can limit nutrient uptake or cause similar symptoms.

Tomato showing blossom-end rot
Low calcium delivery Blossom-End Rot Low calcium delivery can create a dark, sunken patch at the blossom end.
Read more

Calcium moves into fruit with water. Irregular watering, damaged roots, heat or very high humidity can interrupt that movement even when calcium is present in the feed. Check moisture consistency and root health before increasing the nutrient rate.

Leaf showing yellowing between green veins
Low magnesium Yellow Between Veins Older leaves can turn yellow between veins while the veins remain green.
Read more

Magnesium is essential for chlorophyll, so a shortage reduces the plant’s ability to keep leaves green and capture light. Symptoms often begin on older leaves because the plant can move magnesium toward newer growth. Incorrect pH can also make magnesium unavailable.

Plant showing calcium and magnesium deficiency stress
Low calcium or magnesium Weak, Stressed Growth Low calcium can distort new growth; low magnesium can reduce leaf colour.
Read more

Calcium supports new cell formation, while magnesium supports chlorophyll and energy production. When either nutrient is unavailable, plants may grow slowly, develop twisted young leaves or lose healthy green colour. Check whether the symptoms begin on new or older growth.

Healthy developing plant roots
Low calcium Poor Root Development Too little available calcium can weaken developing root tips.
Read more

Calcium helps plants form strong cell walls and healthy new roots. Weak or damaged roots can then reduce water and nutrient uptake, creating symptoms above the root zone. Inspect roots for browning, poor aeration or disease before assuming the feed is too weak.

Fruit showing poor development
Low calcium delivery Poor Fruit Development Low calcium delivery can contribute to weak or uneven fruit development.
Read more

Developing fruit relies on calcium for strong cell structure. A shortage at the fruit can contribute to soft tissue, cracking, localised damage and reduced quality. Fast growth and inconsistent moisture increase demand, so steady watering is as important as nutrient supply.

Leaf showing yellow and damaged edges
Check nutrient availability Leaf Stress Calcium and magnesium shortages usually affect different parts of the plant.
Read more

Magnesium problems commonly begin on older leaves, while calcium problems usually affect tender new growth first. Burnt edges or yellow leaves can also come from excessive feed, poor pH, root damage or watering stress, so look at the whole plant before treating it.

Build A Better Feeding Setup

The Foundation for a Complete Feed

Cal-Mag is the "missing link" in most feeding routines. Integrate it with your core nutrients to unlock professional-tier growth, better fruit quality, and total nutrient stability.

Works with sprayer Compatible with key formulas Great cart builder Bundle-ready upsell
CompleteGrow Cal-Mag

Why Add Cal-Mag?

Optimize Every Drop

Cal-Mag isn't just an additive—it’s an optimizer. By adding it to your setup, you ensure your primary nutrients work harder and your plants stay resilient under heavy feeding.

  • Eliminates "nutrient lockout" in high-demand grows.
  • Essential for Citrus & Fruit: Specifically prevents rot and blossom drop.
  • Drastically improves uptake when used with a sprayer.
GROWER’S FAVORITE All Purpose Plant Liquid Fertiliser

The Ultimate Everyday Duo

All Purpose Liquid

Combine the versatility of All Purpose Liquid with Cal-Mag to provide a bulletproof foundation for indoor plants, veggies, and general garden beds. Pair with Cal-Mag for a stronger everyday feeding routine across indoor plants, veggies and garden beds.

  • Growth Booster
  • Simple to use
  • Routine Vitality
NPK 20-20-20 Powder

High-Intensity Performance

NPK 20-20-20 Powder

For heavy feeders and large-scale gardens. Adding Cal-Mag to your powder routine stabilizes mineral levels and supports massive vegetative growth. Use with Cal-Mag to support stable feeding and stronger vegetative growth in heavy-feeding plants.

  • Commercial Grade
  • Flexible mixing
  • Nutrient Stability
PREVENTS BLOSSOM ROT Citrus Fertiliser

Targeted Support for Citrus

Citrus Fertiliser

Citrus trees are heavy feeders of both Calcium and Magnesium. Pair Cal-Mag with our Citrus Fertiliser to prevent leaf yellowing and blossom end rot, ensuring glossy foliage and heavy, juicy fruit. Pair with Cal-Mag to support greener leaves, better fruit quality and stronger citrus performance.

  • Stop Leaf Yellowing
  • Fruit Quality Boost
  • Green Foliage
FASTEST ABSORPTION CompleteGrow Sprayer

Works With Cal-Mag

CompleteGrow Sprayer

The fastest way to fix a deficiency. Use the sprayer for a Cal-Mag foliar feed to bypass root issues and deliver minerals directly to the leaves. Use the sprayer with Cal-Mag for faster foliar feeding and quicker nutrient uptake.

  • Easy application
  • Instant Uptake
  • Strong add-on

Bundle Deals With Cal-Mag

The Professional Grower’s Routine

Don’t just feed, build a stronger complete setup. Bundling Cal-Mag with your core nutrients gives growers a smarter, more cost-effective way to support better plant performance with fewer gaps in the routine. Bundle Cal-Mag with your core nutrients for a smarter, more complete growing setup.

  • Full Setup Savings
  • Precision Growth
  • Complete Support
CompleteGrow bundle with Cal-Mag

The Essential Foundation

Mix

0.5 to 1ml per litre of water.
Highly concentrated formula. Compatible with all base nutrients and hydroponic systems.

Apply

PREVENT OR CORRECT

Ditch the measuring cups. Our precision sprayer automatically mixes the perfect ratio for you. Just attach to your hose, dial in your feed, and cover your entire garden in minutes with zero guesswork.

Feeding Level Mix (1L Bottle)
Standard 100ml fertiliser + 900ml water
Want faster, simpler feeding?

Thrive

ROBUST STRUCTURE • VIBRANT GREEN
Optimizes chlorophyll production and strengthens cell walls for heavy-fruiting stability.

How Much to Mix

Cal-Mag — Mixing Calculator

Set your ml/L and litres — totals update automatically, with caps estimate.

Approx. 1 cap ≈ 15–20 ml.

Reviews From Our Gardener's

Reviews

5.0 Based on 7 reviews
Laura K.

Plants look stronger

"Noticed stronger stems and healthier leaves after using this. Works well with my setup."

Chris A. Verified Buyer

Good addition to feeding routine

"Added this alongside my normal nutrients and it’s made a noticeable difference in plant strength."

Paul N. Verified Buyer

Noticeable difference

Stems feel stronger and leaves look better. Works well with the rest of my setup.

Page 1 of 3
Noticed healthier growth within a week. I use it in all my garden bed soils. very fast shipping have also used there all purpose liquid fertilizer combined with this have been seen great results

Ben R

Verified Buyer

This is a great fertiliser, have used for 2 weeks now and can see very good growth taking place .Will definitely get this again. I have very poor dirt where i live so this has helped my plants alot

Chloe M

Verified Buyer

Cal-Mag Hydroponic Nutrients Fertiliser

Double-strength Cal-Mag fertiliser made with chelated Calcium, Magnesium, and Iron for fast-growing plants. Prevents common deficiencies like blossom end rot and tip burn. Ideal for hydroponics or soil. NPK 4‑0‑0. Trusted by commercial growers. Free shipping Australia-wide.
High-strength Cal-Mag formula for fast-growing plants
✅ Chelated Calcium & Magnesium for rapid absorption
✅ Prevents blossom end rot, tip burn & stunted growth
✅ Twice the strength of standard Cal-Mag formulas
✅ Suitable for hydroponics & soil-based systems
✅ Made in Australia – trusted by commercial growers

NPK Ratio — Cal-Mag (Hydroponic)

  • N
    4
  • P
    0
  • K
    0
  • Ca
    6%
  • Mg
    2%
  • Fe
    0.1%

What Cal-Mag (NPK 4-0-0) Means

Chelated Calcium and Magnesium to strengthen new growth, deepen green colour and stabilise nutrient uptake in hydro, coco and soil. Double strength for fast correction and steady support.

  • Stronger structure: Calcium reinforces cell walls and root tips for firm, resilient growth.
  • Greener leaves: Magnesium drives chlorophyll production for rich colour and efficient photosynthesis.
  • Prevents issues: Helps avoid blossom-end rot, tip burn, poor setting and stalled growth in fast-growing, heavy-feeding plants.
Read More

Cal-Mag supplies essential Calcium and Magnesium in forms plants can absorb quickly. Calcium supports strong meristems, roots and overall firmness, while Magnesium sits at the core of chlorophyll to power energy capture. Use whenever water is soft/RO, media is coco-based, light intensity is high, or feeds are heavy in potassium or ammonium which can compete with Ca/Mg.

  • Add to water first, mix well, then add base nutrients and any boosters.
  • Hydro/coco: use a steady low dose each feed; soil: light, regular doses during active growth.
  • Look for pale older leaves (Mg) or brittle tips/poor fruit set (Ca) as signs to maintain Cal-Mag support.

FAQ

It supports cell strength, prevents deficiencies like blossom end rot or tip burn, and improves nutrient uptake in fast-growing crops.
This formula is double strength and uses chelated minerals for faster, more effective absorption. You need less to see better results.
Yes – it’s made for commercial hydroponics and works great in any system: NFT, DWC, coco, soil or drip setups.
Absolutely. It’s designed to be used in both veg and flower stages to support calcium and magnesium needs throughout the plant’s life cycle.
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