Coco Bricks Substrate Base | 10 L (6 Bricks)

Coconut coir is the bulk-substrate workhorse of modern mycology. Our 10 L pack delivers 6 compressed Bio Nova coir bricks — buffered, washed and low in electrical conductivity, so you can build a clean CVG mix without surprise pH swings or salt build-up.

Product specifications

• Pack size: 10 L bag containing 6 compressed coco bricks
• Brand: Bio Nova (BN) — professional growing media supplier
• Expansion: each pack hydrates to approximately 60 L of fluffy coir
• Properties: buffered, washed, low EC (electrical conductivity)
• Composition: pure coconut coir pith — no perlite, vermiculite or gypsum added

Why coco coir for mushroom substrate

Coir is one of the three pillars of the classic CVG (Coir, Vermiculite, Gypsum) bulk substrate. It holds water tightly while keeping enough air space for mycelium to breathe, and its near-neutral pH plays well with manure-loving cubensis-type species. Buffered Bio Nova coir is washed during production to remove the natural sodium and potassium found in raw coconut husks — that step matters because high salt levels stress mycelium.

Build your own CVG mix

Standard CVG recipe by volume is 2 parts coir : 2 parts vermiculite : 1 part gypsum. With this 10 L pack (~60 L hydrated) you have enough coir for about 150 L of finished CVG when combined with 60 L of vermiculite and 30 L of gypsum.

1. Hydrate — drop the bricks in a clean bucket and add ~5 L of warm water per brick
2. Expand — wait 15–30 minutes; the bricks fluff up to roughly 10× their dry volume
3. Fluff — break apart by hand and aerate
4. Mix — combine with vermiculite and gypsum at 2:2:1 by volume
5. Pasteurise — heat the wet mix to 65–82 °C for 1–2 hours
6. Inoculate — once cooled to 24–27 °C, add grain spawn at 1:2 ratio by weight

Which mushrooms grow on coir-based substrate

• Psilocybe cubensis — all strains (B+, Golden Teacher, PES, etc.)
• Pleurotus eryngii — king oyster (with straw supplementation)
• Stropharia rugosoannulata — wine cap
• Agaricus species — button mushroom (with manure supplement)

For wood-loving species like shiitake, lion's mane or reishi, choose beech woodchips instead.

Skip the DIY step

If you'd rather skip the hydration and mixing, we sell a ready-to-use sterile CVG mix that's already hydrated, pH-buffered and autoclaved: Sterile CVG Substrate Mix .

Pair with grain spawn and gypsum

Complete your CVG build with active grain spawn and a pH buffer: Sterile Millet Spawn Bag and Gypsum 500g .

Storage

Store unopened bricks in a cool, dry place. The compressed bricks have a shelf life of several years when kept dry. Hydrated coir should be used within a few days or pasteurised and stored sealed.