Description
Coco Coir Block 4.5kg (Expands to 70L) – Premium Bulk Substrate for Mushrooms
Our 4.5kg coco coir block expands to approximately 70 litres of hydrated coir, making it the perfect bulk substrate base for mushroom cultivation. Lightweight when compressed but highly absorbent when hydrated, coco coir provides excellent moisture retention, aeration, and contamination resistance — all essential for successful mushroom growing.
Widely used in monotubs, trays, and bulk grow setups, coco coir is the industry standard for creating high-yield mushroom substrates. Simply hydrate the block with hot water, fluff it up, and mix with vermiculite and gypsum to prepare a reliable substrate mix that encourages strong mycelial colonization and multiple flushes.
The 70L expanded volume makes this block highly economical and efficient for larger grows, offering consistent performance for both hobbyists and commercial cultivators.
🌱 Why Choose Our Coco Coir Block?
4.5kg compressed block – expands to 70L hydrated coir
Bulk volume – ideal for monotubs and bulk substrates
Moisture retention & aeration – keeps substrates fluffy and hydrated
Eco-friendly & renewable – sustainable coconut husk fibre, chemical-free
Proven in mushroom cultivation – trusted by home and professional growers
📘 How to Use Coco Coir in Mushroom Cultivation
Hydrate the Block: Add hot or boiling water to the 4.5kg block. Once fully expanded, break apart into fluffy coir.
Prepare Substrate Mix: Combine with vermiculite and gypsum for a high-performance bulk substrate.
Monotub Use: Layer the coir mix with colonized grain spawn to create bulk trays or tubs.
Casing Layers: Apply a thin layer of hydrated coir over colonized substrates to promote fruiting.
❓ Frequently Asked Questions – Coco Coir 4.5kg / 70L
1. How much substrate does a 4.5kg coir block make?
Each 4.5kg block expands to around 70 litres of hydrated coco coir, providing enough material for multiple monotubs, trays, or bulk substrate projects.
2. Do I need to sterilize coco coir before using it?
Coco coir is naturally resistant to contamination, but it’s best to pasteurize or heat-treat it before use, especially when mixing with other ingredients. Many growers simply hydrate with boiling water to achieve both expansion and pasteurization.
3. Can I use coco coir on its own for mushrooms?
Yes, but coco coir works best when combined with vermiculite and gypsum to create a balanced substrate that holds moisture, provides aeration, and supports healthy mycelium growth. This mixture is called the CVG mix.
4. How is coco coir different from vermiculite?
Coco Coir: Provides structure, organic base, and good hydration for bulk substrates.
Vermiculite: A non-nutritive mineral that improves aeration and water retention.
Most mushroom growers use a coir + vermiculite mix for optimal results.
5. Is coco coir eco-friendly?
Yes! Coco coir is made from coconut husk fibre, a renewable and sustainable resource. It’s chemical-free and environmentally friendly compared to peat-based products.
Fast UK and International delivery of coco coir blocks
Try this user friendly core based product today and get fast shipping to both UK and international destinations.
