In this post, we’ll break down why coco coir is becoming the go-to medium for cannabis cultivation, how to fertilise it properly, and how to make the most of the full B’cuzz Coco range from Atami: Coco A&B, Coco Booster Uni, Coco Bloom Stimulator, and yes… Bloombastic and Rokzbastic are absolute musts in your final flowering weeks.
As cannabis cultivation evolves to be more efficient, sustainable and high-yielding, coco is emerging as one of the smartest alternatives. If you want to take your harvest to the next level, coco might just be your new best friend.
TABLE OF CONTENT
1. Why Grow Cannabis in Coco Instead of Soil?
a. Top Benefits of Growing Cannabis in Coco Coir
2. How to Fertilise Coco Coir for the Best Yields
a. What’s in the B’cuzz Coco Line?
3. Which Coco Substrate to Use with B’cuzz? Your Style, Your Choice
a. What Makes Atami Coco So Reliable?
b. Our Coco Substrates at a Glance
Why Grow Cannabis in Coco Instead of Soil?
One of these substitutes is coco fibre.
Imagine a substrate that breathes, drains well, but retains just the right amount of moisture your roots need to expand without stress. That’s coco fibre.
What’s more, it’s an inert growing medium, meaning it contains no nutrients on its own.
That might sound like a downside at first, but for cannabis growers, it’s a major advantage.
Why? Because you get full control over what your plants absorb and when. That means faster responses, better precision with your nutrient feed, and fewer surprises during the grow.
Coco also has a light, airy texture that keeps your roots well-oxygenated and helps prevent overwatering — a common issue with heavy soils. Especially if you’re running an indoor grow tent or aiming for dense, high-quality buds, coco gives your cannabis roots the ideal environment to thrive.
Whether you’re growing photoperiods or autos, coco’s got your back.
Top Benefits of Growing Cannabis in Coco Coir
✔️ Light and airy structure that boosts root oxygenation — stronger roots = stronger plants.
✔️ Absorbs and holds water without becoming waterlogged. Say goodbye to overwatering issues.
✔️ Reusable with proper maintenance, so you get more value per grow cycle.
✔️ More sustainable than peat — and with peat bans already active in the UK, coco is the go-to option for eco-conscious growers.
It’s all about structure: coco doesn’t compact, it doesn’t drown your roots, and it stays evenly moist. That’s why many cannabis cultivators report faster growth, improved nutrient uptake, and fewer headaches like root rot or stunted development.
So, it’s no wonder coco has become a favourite — whether you’re a first-time grower or a seasoned cultivator.
But here’s the thing: getting great results in coco isn’t automatic. To really crush it, you’ll need proper care and fertilisers made specifically for coco substrates.
That’s where B’cuzz steps in.
How to Fertilise Coco Coir for the Best Yields
So, now you know coco coir is a top-tier substrate. But here’s the catch: coco is not soil.
And that means you can’t treat it like soil — especially when it comes to nutrients.
Coco fibre has a peculiarity: it is naturally rich in potassium, but poor in calcium.
If you don’t balance that from the start, your plants will show deficiencies fast — and nobody wants malnourished and unproductive plants.
That’s why at Atami, we created a full line designed just for coco:
👉 B’cuzz Coco — nutrients tailored to unlock the full potential of this “new soil”.
What’s in the B’cuzz Coco Line?
Here’s a quick guide to each product in the range and when to use it in your cannabis grow:
| Product | What does it bring? | When to use it? |
| Coco A | Calcium (4% w/w), nitrogen and base nutrients | Throughout the entire grow |
| Coco B | Phosphorus and essential micronutrients | Alongside Coco A, full grow cycle |
| Coco Booster Uni | Plant extracts, magnesium and iron | During the transition from veg to bloom — helps reduce stress and boost growth |
| Coco Bloom Stimulator | Natural flowering stimulator | From the first signs of flowering — triggers early bud development |
Together, these four cover your entire coco grow cycle, from seedling to harvest.
But there’s more…
When your plants start packing on weight during late flowering, it’s time to bring in the heavy hitters:
Bloombastic and Rokzbastic — two bloom additives that level up your results in coco coir.
• Bloombastic: a balanced PK booster enriched with biostimulants and iron. Perfect for ramping up terpene production and enhancing buds’ natural flavour and aroma.
• Rokzbastic: high-potassium formula (2x more K than P) that helps your plants finish strong, building dense, rokz-solid flowers and fruits.
The result? Shiny, heavier, tastier harvest— exactly what you’re after.
Which Coco Substrate to Use with B’cuzz? Your Style, Your Choice
You’re already sold on the benefits of growing cannabis in coco.
And you know standard soil nutrients won’t cut it — you need a tailored feed like B’cuzz Coco.
But there’s one more key ingredient for a standout grow: High-quality coco substrate.
A poorly processed coco coir can ruin your crop. At Atami, we don’t take chances.
We control the entire process — from raw material selection to final packaging — to guarantee you clean, stable, grow-ready coco.
What Makes Atami Coco So Reliable?
👉 Correctly Aged– we age the material to break down any remaining organic matter.
👉 Washing – to flush out salts and residues that may affect the electrical conductivity (EC) of the substrate.
👉 Perfect buffering – we adjust the pH and pre-balance calcium and magnesium, so your coco won’t “steal” nutrients from your plants.
The result? A clean, stable and balanced substrate. Ideal for using it directly with the B’cuzz Coco range, with no surprises or nutrient blockages.
Our Coco Substrates at a Glance:
• Cocos Substrate: a professional, ready-to-use coco with high water holding capacity and excellent drainage. It has a medium fertilisation.
• High Porosity Cocos: with added perlite to further improve aeration and prevent compaction. It has a medium fertilisation.
• Washed & Buffered Cocos: is the same as Coco Susbtrate but with a big difference: no pre-fertilisation. It is an ideal blank canvas for experienced growers who want to start their nutrition from scratch, and for cuttings and sprouts.
• Coco Slabs: perfect for drip systems, run-to-waste setups or in-line cultivation. Same high standard in a hydroponic-friendly format.
Calcium & Magnesium: The Essentials of Coco Cultivation
Coco coir naturally comes packed with potassium – great, right? Well, yes… but it also tends to hang on to calcium and magnesium, which can stop your plants from taking them up properly if you’re not careful.
So, what does that mean in real terms?
Even with a good nutrient line, you could be setting your plants up for deficiencies if you’re not adding a calcium and magnesium supplement.
At Atami, we know this all too well. That’s why Coco A is enriched with extra calcium (4% w/w) – ideal for working in perfect balance with our pre-buffered coco coir substrates.
Still, if you’re growing heavy feeders or using soft water (low in minerals), topping up with extra CalMag can be a game-changer, especially in the early veg stage when demand is higher.
Keep an eye out for early signs of deficiency – yellow leaf edges, twisted new growth, or sluggish development. Spot any of these? Bring in ATA CalMag. Your plants will bounce back – and it’ll show you in the production.
💡 Pro tip:
If you want to continue applying a CalMag supplement during flowering, but without adding extra nitrogen, then VGN CALMAG is your ally! This organic supplement is nitrogen-free.
Top Tips for Getting the Best Out of Your Coco Grow
• Start with quality coco Not all coco is produced equal. Go for a properly washed, buffered and stable substrate – like Atami’s. Cheap or poorly processed coco can do more harm than good (hello, nutrient lockout 👋).
• Get your watering game right Coco drains beautifully but holds moisture too. The trick is little and often – better to water a few times a day in small amounts than flooding once and walking away.
• Dial in your pH and EC Balance is everything in coco. Keep pH between 5.5 and 6.2 and adjust your EC depending on the growth stage (veg or bloom). A good set of meters is your best friend here.
• Use coco-specific fertilisers Coco has unique needs – don’t try to wing it with generic fertilisers. Use products designed for coco, like B’cuzz Coco A&B, Coco Booster Uni and Coco Bloom Stimulator. And don’t forget your CalMag! If your plants ask for it, If your plants ask for it, ATA CalMag or VGN CALMAG delivers.
• Reuse coco – but do it right Good news: you can reuse coco 2 or even 3 times. Just make sure to flush it thoroughly between runs and re-buffer it before starting fresh. A clean start = happy roots.
Growing in coco is easy – when you know what you’re doing.
With Atami’s coco substrates and nutrients, you’ve got everything you need to level up your grow. Clean, efficient, productive.
Ready to grow some giants? We’ve got your back.
