Description

Keep your plants thriving with Dutch Pro CalMag, a concentrated dual-element supplement designed to prevent and correct calcium and magnesium deficiencies, two nutrients vital for plant structure, chlorophyll production and overall plant development. Perfect for growers using soil, coco or hydroponic systems, this additive ensures your plants get the extra support they need for vigorous growth and optimal yields.

read the full product overview here...

Plants require calcium (Ca) and magnesium (Mg) in significant amounts to maintain strong cell walls, support enzyme activity and produce chlorophyll, the green pigment critical for photosynthesis. Dutch Pro CalMag delivers these elements in a highly concentrated, easy-to-mix liquid that helps eliminate deficiencies before they impact growth. Its balanced formula also includes a small amount of nitrogen to further support plant metabolism.

Use Dutch Pro CalMag regularly throughout your grow cycle, especially in fast-growing or CO₂-enriched environments where plants can utilise more calcium and magnesium than usual.

Key Features & Benefits

  • Prevents & Corrects Ca/Mg Deficiencies: Calcium and magnesium are essential for healthy cell structure and chlorophyll production, key to strong leaves, stems and overall plant vigour.
  • Boosts Chlorophyll & Photosynthesis: Ensures sufficient magnesium levels so plants can produce chlorophyll efficiently and convert light into energy.
  • Supports Healthy Growth: Including a touch of nitrogen helps promote protein synthesis and energy transfer within the plant.
  • Suitable for All Media: Works with soil, coco coir and hydroponic systems, giving you flexibility across grow setups.
  • Clean, PGR-Free Formula: No plant growth regulators (PGRs) are used, keeping your nutrition clean and predictable.
  • Easy to Mix & Apply: Concentrated liquid form mixes quickly with water for consistent feeding at every stage of growth.

How to Use

  • Shake well before use.
  • Dosage: Mix 0.1 to 1 ml per 1 L of water, adjust within this range based on plant needs and growth stage.
  • Feeding Frequency: Use alongside your regular nutrient solution throughout veg and bloom to maintain adequate Ca and Mg levels.
  • Application: Add Dutch Pro CalMag directly to your feed water and mix thoroughly. Suitable for manual watering or automated irrigation systems.

Frequently Asked Questions (FAQ)

What does Dutch Pro CalMag do?
It supplements calcium and magnesium, two key macro elements plants use for cell structure, chlorophyll production and enzyme function, helping prevent deficiency symptoms and maintain healthy growth.

When should I use CalMag?
Use it throughout the grow cycle, especially in fast growth, CO₂-enriched environments, or when plants show signs of magnesium or calcium deficiency.

Can CalMag be used with other nutrients?
Yes, it’s designed to complement base nutrients in soil, coco and hydroponic systems. Always mix CalMag with water before adding other additives.

Does this product contain plant growth regulators (PGRs)?
No, Dutch Pro CalMag is free from PGRs, keeping your nutrient programme clean and predictable.

Will CalMag help my yield?
By correcting Ca/Mg deficiencies and supporting chlorophyll production and nutrient uptake, CalMag can help plants maintain healthy growth and reach their yield potential.

If your plants are growing quickly, are in CO₂-enriched environments, or are showing early signs of calcium or magnesium deficiency, adding Dutch Pro CalMag to your feeding schedule helps maintain balanced nutrition. Proper calcium and magnesium levels are essential for strong root and stem development, effective photosynthesis and smooth nutrient transport, all of which contribute to healthier plants and better crop performance.

Explore the range

See all Additives & Boosters (153)

Not sure which one is right for your setup? Message us on WhatsApp or call 0121 553 7872.

Delivery, returns and FAQs

Will my order arrive in plain packaging?

Yes. Every order is sent in plain, unbranded packaging as standard.

How quickly will my order arrive?

Order standard size items by 12pm on a working day and choose Next working day at checkout, and your order will be with you the next working day. Standard delivery takes 2 to 3 working days.

Bulky items such as grow tents, large fans and 50L bags of soil go by courier in 2 to 3 working days, or on a pallet for very heavy orders. Next day is not available for these, and if your basket includes a bulky item the whole order travels with it.

UK delivery is free on orders of £94.99 or more, except for bulky items. See our delivery page for full prices.

Can I collect from the shop?

Yes. Choose Click & Collect at checkout and pick up for free from our shop at Unit 2 Black Lake, West Bromwich, B70 0PJ. Orders are usually ready within 1 hour.

Can I return an item?

You have 14 days from receiving your order to tell us you want to cancel, then a further 14 days to send it back. Items need to be unopened and in a resaleable condition.

If you change your mind, the return postage is paid by you. If something arrives faulty or damaged, send us photos within 48 hours and we will cover the cost of putting it right. Full details are in our refund policy.

Do you price match?

Yes. If you find the Dutch Pro Cal Mag cheaper at another UK retailer, use the Price Match button on this page. We usually reply within one business day.

Need help choosing?

Speak to our team. Call us on 0121 553 7872, message us on WhatsApp, or visit the shop in West Bromwich.

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