Description

Prevent nutrient deficiencies and support robust plant development with Mills CalMag, a high-quality calcium and magnesium additive designed for soil, coco and hydroponic systems. Trusted by growers, Mills CalMag provides these essential secondary nutrients in a form that is readily absorbed, helping to strengthen cell walls, improve leaf health and support overall plant vitality.

Read the full product overview here...

Mills CalMag delivers a precise blend of calcium and magnesium, two critical nutrients required for strong structural growth, nutrient uptake and photosynthesis. Calcium supports cell wall formation and root development, while magnesium is a core component of chlorophyll, aiding energy production and growth efficiency.

Formulated to prevent common deficiencies, Mills CalMag is especially useful in soft water areas or when using reverse osmosis (RO) water, where calcium and magnesium levels may be naturally low. Easy to mix and integrate with your base nutrient program, it ensures consistent, reliable plant performance.

Key Features & Benefits

  • Prevents Deficiencies: Supplies calcium and magnesium in a highly available form.
  • Supports Vigorous Growth: Strengthens stems, roots and overall plant structure.
  • Enhances Nutrient Uptake: Improves absorption of other essential nutrients.
  • Versatile Application: Suitable for soil, coco coir and hydroponic systems.
  • Easy to Use: Simple to add to your nutrient solution without complex preparation.
  • Compatible with Base Nutrients: Complements Mills Basis A & B and other nutrient programs.

How to Use

  • Shake Well: Always shake before use.
  • Dosage: Add 1 to 3 ml per litre of water, adjusting based on plant needs and water hardness.
  • Frequency: Use regularly throughout the vegetative and flowering stages, or when deficiency symptoms appear.
  • Mixing: Combine with your base nutrients, ensuring even distribution and proper pH balance.

Frequently Asked Questions (FAQ)

When should I use Mills CalMag?
Use throughout the entire growth cycle, particularly in soft water areas or when using RO water. It’s also ideal when deficiency symptoms, such as leaf curl or yellowing, appear.

Can it be used with all grow mediums?
Yes, compatible with soil, coco coir and hydroponic setups.

Does it replace a base nutrient system?
No, Mills CalMag is an additive, designed to supplement your existing nutrient program.

Will it work in hard water?
Yes, effective in both soft and hard water, but particularly beneficial where calcium and magnesium are naturally low.

Calcium and magnesium are essential secondary nutrients that directly affect plant strength, leaf health and nutrient efficiency. Mills CalMag ensures your plants have a steady supply, reducing the risk of deficiencies that can stunt growth or reduce yields. By supporting structural integrity and enhancing nutrient uptake, it helps growers achieve stronger, healthier plants with better overall performance, making it an essential supplement for any serious grower.

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 Mills CalMag Calcium & Magnesium Additive 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.

You may also like

Recently viewed