Coco Coir Bricks UK — Compressed Buffered Blocks | Free Delivery

Use a wheelbarrow, mortar tub, or large storage box. The brick will expand to 15× its compressed size, so allow plenty of room.

Pour warm water over the brick evenly. Leave it to absorb for 20–30 minutes, then break apart any remaining clumps by hand.

Use pure for hydroponics, or blend with compost and perlite for containers. See our mix ratios page for crop-specific recipes.

Every brick is pre-treated with calcium and magnesium to neutralise the cation exchange sites. This prevents Ca/Mg lock-out — the number one cause of poor results with cheap coco coir. Read our buffering guide.

Washed three times in fresh water to remove excess sodium and chloride. Our EC is tested at ≤ 0.50 mS/cm — well below the 1.0 mS/cm threshold where salt damage begins.

pH 5.5–6.5 straight out of the brick — the ideal range for nutrient uptake across vegetables, flowers, and herbs. No pH adjustment required before planting.

Each 5 kg brick expands to approximately 75 litres — enough to fill several large pots, a standard grow bag, or a section of a raised bed.

Made entirely from coconut husk — a renewable by-product. No peat, no added chemicals, no synthetic wetting agents. See our peat-free compost guide.

Every order ships free to mainland UK addresses. Bricks arrive in protective packaging to ensure they reach you dry and intact.

Approximately 20–25 litres of water. Pour it evenly over the brick in a large container and wait 20–30 minutes. Break apart any remaining clumps by hand. The brick expands to roughly 75 litres of ready-to-use growing medium.

Yes. You can break off a portion of the dry brick with a saw or chisel and hydrate only what you need. Store the remaining dry portion in its packaging — it will keep indefinitely.

Unbuffered coco coir has empty cation exchange sites that lock out calcium and magnesium from your nutrient solution — causing deficiencies. Buffered bricks have been pre-treated so those sites are already occupied with Ca/Mg. This means your plant food goes to the plants, not into the substrate. Always choose buffered.

Yes. Coco coir is nutrient-neutral — it provides the physical structure and water retention, but contains no significant plant food. Start a liquid feed programme from the first week of growth. Any general-purpose or coco-specific nutrient will work.

A standard 4 ft × 8 ft raised bed at 12 inches deep holds approximately 720 litres. You would need roughly 10 bricks to fill it completely with coco coir, or fewer if blending with compost and perlite. Our mix ratios page has specific recommendations.