Helps correct yellowing leaves and builds thicker cell walls
£6.99
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Description
Key benefits
Helps correct yellowing leaves and builds thicker cell walls
Magnesium keeps photosynthesis running and leaves green
Calcium builds thicker stems and stronger branches
Replaces calcium in coco coir and semi-hydro setups
Calcium 3.2%, magnesium 1.2%, nitrogen 2.6% and iron 0.1%
Shogun CalMag: The Structural Foundation Your Plants Are Missing
We often focus on the main nutrients, but your plants will never reach their full potential without a solid backbone. Shogun CalMag provides a rich, optimised source of the two most critical secondary nutrients: Calcium and Magnesium.
Think of this as the "bodybuilder" supplement for your indoor jungle. It doesn't just cure yellowing leaves; it thickens cell walls, strengthens stems, and ensures your prized Aroids have the structural integrity to support massive foliage.
Please note that we currently do not have 5L, 10L, or 25L bottles in stock at our nursery. This is a special order item and requires a 7-10 day processing time before your order is dispatched.
Why It’s a Game Changer
The Green Machine (Magnesium): Magnesium is the central atom of chlorophyll. Without it, your plants cannot photosynthesize effectively, rendering your expensive grow lights useless. Shogun CalMag keeps photosynthesis running at full speed, keeping leaves lush and green.
Built Tough (Calcium): Calcium aids in the thickening of cell walls. This creates visibly thicker stems and stronger branches, improving nutrient transport and making your plants more resilient against pests and environmental stress.
Essential for Coco Coir: If you grow in Coco Coir or semi-hydro, this bottle is non-negotiable. Coco coir naturally "locks up" calcium, stealing it from your plants. This supplement replenishes those levels to prevent early deficiencies.
Complete Balance: Unlike basic supplements, Shogun includes Nitrogen (2.6%) to aid uptake and Chelated Iron (0.1%) to prevent micro-deficiencies that often accompany Calcium issues.
How To Use
Root Feed (Maintenance): Use 0.5ml – 1ml per litre throughout active growth. This is key for preventing issues before they start.
Root Feed (Deficiency): If you see rusty spots or yellowing between veins, increase the dose to 1ml – 2ml per litre to correct the imbalance.
Foliar Spray (Emergency Fix): For rapid results, you can use CalMag as a foliar spray. Mix 15ml per litre and spray the leaves just before your lights go off (or at sunset) once a week until the problem is resolved.
Product Specs
Nitrogen: 2.6%
Calcium: 3.2%
Magnesium: 1.2%
Iron: 0.1%
Available Sizes: 250ml, 1L, 5L and 10L
How to use
For maintenance, root feed at 0.5 to 1ml per litre throughout active growth
If you see rusty spots or yellowing between veins, increase to 1 to 2ml per litre
For a quick fix, mix 15ml per litre and spray the leaves once a week at sunset or before lights off
Delivery and returns
See all delivery pricing tiers
Based on your basket total, confirmed at checkout. Free delivery: Economy over £60 · Standard over £100 · Express over £150.
Every order is hand-packed and sent with tracked delivery.
Changed your mind? You can return unused items within 14 days of delivery. See our returns policy.
Your quick reference for choosing the right plant size. We group our plants by the diameter of their nursery pots which gives you a consistent way to understand scale.
5–8cm
Mini
Small but full of charm. These compact plants are perfect for desks, windowsills, and small shelves, or for building out a collection over time. Ideal if you enjoy watching your plants grow from the beginning. Approx. height: 10–20cm
9–11cm
Small
A step up in presence, great for side tables, shelves, or styling in clusters. Easy to move around and perfect for adding greenery without taking up too much space. Approx. height: 25–35cm
12–14cm
Medium
Our most versatile size. Works beautifully on shelves, desks, and plant stands, offering a fuller look without dominating a space. A great balance between impact and flexibility. Approx. height: 25–50cm
15–18cm
Large
More established plants with fuller foliage and stronger structure. Ideal for creating soft focal points in a room. Great for corners, beside furniture, or as standalone features. Approx. height: 40–70cm
19+cm
Extra Large
Big, impactful plants designed for floors and open spaces. These are your statement pieces and are perfect for anchoring a room or transforming a corner with instant greenery. Approx. height: 60cm–1.3m
Pots that fit this plant
We recommend
In their words
What our customers say
EP
Emily P.
Arrived just like the photos - maybe even fuller. Healthy, well-acclimated, and straight into my collection with no issues.
JR
James R.
Flawless leaves, stunning variegation, and clearly cared for by experts. It’s already a talking point in my home office.
SL
Sophie L.
Hard to find rare plants that are pet-safe. Ours arrived in perfect condition and looks amazing without any worry.
Good to know
Frequently Asked Questions
What is your returns policy?
Changed your mind? You can return pots, gifts, accessories and other non-plant items. Email hello@growtropicals.com with your order number within 14 days of delivery, then send the item back within 14 days of telling us. You pay the return postage.
Items must come back unused and in their original condition. If an item has been used, we may reduce your refund by the value it has lost, and for used items this can be the full price.
Live plants cannot be returned because you have changed your mind, but they are covered by our Live Arrival Guarantee.
If something arrives damaged, faulty or wrong, email us with your order number and photos and we will put it right at no cost to you. Full details are in our returns policy.
When will my order arrive and how much is shipping?
Choose your delivery speed at checkout. Express orders placed before 1pm are dispatched the same day, otherwise the next working day. Standard orders are dispatched within 2 to 3 working days and Economy orders within 4 to 5 working days. Once dispatched, every order travels by 24 hour tracked courier.
Delivery is free on orders over £60 with Economy, over £100 with Standard and over £150 with Express. Below that, the charge depends on your basket total and is always shown at checkout before you pay. The full price list is in our shipping policy.
Orders without plants are dispatched Monday to Friday. If your order also includes plants, it goes out Monday to Thursday so the plants are not left in the courier network over the weekend. Delivery can take longer at busy times such as Black Friday and Christmas.
Every order is hand-packed in eco-friendly, protective packaging - refined through thousands of deliveries to ensure your plant arrives healthy, hydrated, and looking its best.
Backed by our Live Arrival Guarantee.
Perfect for Gifting
From rare collector’s pieces to easy-care favourites, our plants arrive fully potted and ready to enjoy. Add a personalised note at checkout for a thoughtful finishing touch.
Delivered fresh, beautiful, and gift-ready.
Sustainability at Heart
All plants are ethically sourced from trusted growers, never wild-collected. Every order ships carbon-neutral in minimal-waste packaging.
